We look at the division of 393331 by 87 
We're looking to find how many times 87 goes into 393331.

Moving on to step 1:
The number 87 fits into 3 0 times, leaving a remainder of 3.
Put 0 as the next digit of the answer. 
Result so far: 0.0
The remainder is 3 after subtracting 0 from 3.
Include the next digit (9) from the dividend after 3, then repeat: 39 / 87

On to step 2:
If we divide 39 by 87, we get 0 and a remainder of 39.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we take 0 away from 39, we end up with 39.
Take the next digit (3) from the dividend and append it to 39, then repeat: 393 / 87

Let's proceed to step 3:
87 goes into 393 4 times with a remainder of 45.
Put 4 as the next digit of the answer. 
Result so far: 4.0
If we take 348 away from 393, we end up with 45.
Include the next digit (3) from the dividend after 45, then repeat: 453 / 87

Let's proceed to step 4:
453 divided by 87 is 5 with a remainder of 18.
Record the quotient 5 as the next digit in the result. 
Result so far: 45.0
Deduct 435 from 453 and we're left with 18.
Append the next digit (3) from the dividend to 18 and continue with: 183 / 87

On to step 5:
183 divided by 87 is 2 with a remainder of 9.
Put 2 as the next digit of the answer. 
Result so far: 452.0
The remainder is 9 after subtracting 174 from 183.
Take the next digit (1) from the dividend and append it to 9, then repeat: 91 / 87

Let's proceed to step 6:
If we divide 91 by 87, we get 1 and a remainder of 4.
The number 1 becomes the next digit in our result. 
Result so far: 4521.0
If we take 87 away from 91, 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.

Step 7:
If we divide 40 by 87, we get 0 and a remainder of 40.
The number 0 becomes the next digit in our result. 
Result so far: 4521.0
If we take 0 away from 40, we end up with 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

Moving on to step 8:
400 divided by 87 is 4 with a remainder of 52.
Use 4 as the next digit of our solution. 
Result so far: 4521.04
If we subtract 348 from 400, we get 52.
Since there are no more digits in the dividend, we add a zero to the remainder making it 520, and continue the process.

On to step 9:
87 can be fit into 520 5 times, resulting in a remainder of 85.
Write down 5 as next digit of the result. 
Result so far: 4521.045
If we take 435 away from 520, we end up with 85.
Since there are no more digits in the dividend, we add a zero to the remainder making it 850, and continue the process.

Step 10:
87 goes into 850 9 times with a remainder of 67.
Write down 9 as next digit of the result. 
Result so far: 4521.0459
Deduct 783 from 850 and we're left with 67.
Since there are no more digits in the dividend, we add a zero to the remainder making it 670, and continue the process.

Step 11:
670 divided by 87 is 7 with a remainder of 61.
Record the quotient 7 as the next digit in the result. 
Result so far: 4521.04597
If we subtract 609 from 670, we get 61.
Since there are no more digits in the dividend, we add a zero to the remainder making it 610, and continue the process.

Let's proceed to step 12:
When dividing 610 by 87, we get 7 with a remainder of 1.
Write down 7 as next digit of the result. 
Result so far: 4521.045977
The remainder is 1 after subtracting 609 from 610.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

The final result is 4521.045977 with a remainder of 1e-07.