We look at the division of 421720 by 73 
We want to divide 421720 by 73.

Step 1:
73 goes into 4 0 times with a remainder of 4.
The next digit of our result is 0. 
Result so far: 0.0
The remainder is 4 after subtracting 0 from 4.
Append the next digit (2) from the dividend to 4 and continue with: 42 / 73

Step 2:
When dividing 42 by 73, we get 0 with a remainder of 42.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtracting 0 from 42 leaves us with 42.
Include the next digit (1) from the dividend after 42, then repeat: 421 / 73

Let's proceed to step 3:
73 goes into 421 5 times with a remainder of 56.
Put 5 as the next digit of the answer. 
Result so far: 5.0
Deduct 365 from 421 and we're left with 56.
Append the next digit (7) from the dividend to 56 and continue with: 567 / 73

Moving on to step 4:
73 can be fit into 567 7 times, resulting in a remainder of 56.
Record the quotient 7 as the next digit in the result. 
Result so far: 57.0
Subtracting 511 from 567 leaves us with 56.
Append the next digit (2) from the dividend to 56 and continue with: 562 / 73

Step 5:
When dividing 562 by 73, we get 7 with a remainder of 51.
Record the quotient 7 as the next digit in the result. 
Result so far: 577.0
Subtracting 511 from 562 leaves us with 51.
Take the next digit (0) from the dividend and append it to 51, then repeat: 510 / 73

Let's proceed to step 6:
73 goes into 510 6 times with a remainder of 72.
Use 6 as the next digit of our solution. 
Result so far: 5776.0
Subtract 438 from 510 to get 72.
Since there are no more digits in the dividend, we add a zero to the remainder making it 720, and continue the process.

Let's proceed to step 7:
The number 73 fits into 720 9 times, leaving a remainder of 63.
Put 9 as the next digit of the answer. 
Result so far: 5776.9
Subtract 657 from 720 to get 63.
Since there are no more digits in the dividend, we add a zero to the remainder making it 630, and continue the process.

Let's proceed to step 8:
The number 73 fits into 630 8 times, leaving a remainder of 46.
Put 8 as the next digit of the answer. 
Result so far: 5776.98
If we subtract 584 from 630, we get 46.
Since there are no more digits in the dividend, we add a zero to the remainder making it 460, and continue the process.

Going ahead to step 9:
73 goes into 460 6 times with a remainder of 22.
The next digit of our result is 6. 
Result so far: 5776.986
Subtracting 438 from 460 leaves us with 22.
Since there are no more digits in the dividend, we add a zero to the remainder making it 220, and continue the process.

On to step 10:
The number 73 fits into 220 3 times, leaving a remainder of 1.
The next digit of our result is 3. 
Result so far: 5776.9863
Subtract 219 from 220 to get 1.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

Step 11:
When dividing 10 by 73, we get 0 with a remainder of 10.
Put 0 as the next digit of the answer. 
Result so far: 5776.9863
Deduct 0 from 10 and we're left with 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Going ahead to step 12:
The number 73 fits into 100 1 times, leaving a remainder of 27.
The number 1 becomes the next digit in our result. 
Result so far: 5776.986301
If we subtract 73 from 100, we get 27.
Since there are no more digits in the dividend, we add a zero to the remainder making it 270, and continue the process.

On to step 13:
The number 73 fits into 270 3 times, leaving a remainder of 51.
Record the quotient 3 as the next digit in the result. 
Result so far: 5776.9863013
Deduct 219 from 270 and we're left with 51.
Since there are no more digits in the dividend, we add a zero to the remainder making it 510, and continue the process.

Moving on to step 14:
When dividing 510 by 73, we get 6 with a remainder of 72.
Record the quotient 6 as the next digit in the result. 
Result so far: 5776.98630136
If we subtract 438 from 510, we get 72.
Since there are no more digits in the dividend, we add a zero to the remainder making it 720, and continue the process.

The final result is 5776.98630136 with a remainder of 7.2e-08.