We're dividing 721057 by 18 
Let's see how many times 18 fits into 721057.

Step 1:
7 divided by 18 is 0 with a remainder of 7.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we take 0 away from 7, we end up with 7.
Fetch the next digit (2) from the dividend, attach it to 7 and continue: 72 / 18

Step 2:
If we divide 72 by 18, we get 4 and a remainder of 0.
The next digit of our result is 4. 
Result so far: 4.0
The remainder is 0 after subtracting 72 from 72.
Append the next digit (1) from the dividend to 0 and continue with: 1 / 18

On to step 3:
If we divide 1 by 18, we get 0 and a remainder of 1.
The number 0 becomes the next digit in our result. 
Result so far: 40.0
Deduct 0 from 1 and we're left with 1.
Append the next digit (0) from the dividend to 1 and continue with: 10 / 18

Step 4:
18 goes into 10 0 times with a remainder of 10.
Put 0 as the next digit of the answer. 
Result so far: 400.0
If we subtract 0 from 10, we get 10.
Append the next digit (5) from the dividend to 10 and continue with: 105 / 18

On to step 5:
If we divide 105 by 18, we get 5 and a remainder of 15.
The next digit of our result is 5. 
Result so far: 4005.0
If we take 90 away from 105, we end up with 15.
Include the next digit (7) from the dividend after 15, then repeat: 157 / 18

Advancing to step 6:
If we divide 157 by 18, we get 8 and a remainder of 13.
Record the quotient 8 as the next digit in the result. 
Result so far: 40058.0
The remainder is 13 after subtracting 144 from 157.
Since there are no more digits in the dividend, we add a zero to the remainder making it 130, and continue the process.

Advancing to step 7:
The number 18 fits into 130 7 times, leaving a remainder of 4.
Write down 7 as next digit of the result. 
Result so far: 40058.7
If we take 126 away from 130, we end up with 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Advancing to step 8:
18 goes into 40 2 times with a remainder of 4.
The next digit of our result is 2. 
Result so far: 40058.72
Subtracting 36 from 40 leaves us with 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Moving on to step 9:
18 can be fit into 40 2 times, resulting in a remainder of 4.
The number 2 becomes the next digit in our result. 
Result so far: 40058.722
Subtracting 36 from 40 leaves us with 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

After the division, we end up with 40058.722 and a remainder of 0.0004.