We look at the division of 56904987 by 399 
We want to divide 56904987 by 399.

Step 1:
399 goes into 5 0 times with a remainder of 5.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtract 0 from 5 to get 5.
Bring next digit (6) of the dividend behind the 5 and repeat the process: 56 / 399

On to step 2:
If we divide 56 by 399, we get 0 and a remainder of 56.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
The remainder is 56 after subtracting 0 from 56.
Append the next digit (9) from the dividend to 56 and continue with: 569 / 399

Moving on to step 3:
If we divide 569 by 399, we get 1 and a remainder of 170.
Record the quotient 1 as the next digit in the result. 
Result so far: 1.0
Deduct 399 from 569 and we're left with 170.
Append the next digit (0) from the dividend to 170 and continue with: 1700 / 399

Let's proceed to step 4:
The number 399 fits into 1700 4 times, leaving a remainder of 104.
Put 4 as the next digit of the answer. 
Result so far: 14.0
If we take 1596 away from 1700, we end up with 104.
Take the next digit (4) from the dividend and append it to 104, then repeat: 1044 / 399

On to step 5:
When dividing 1044 by 399, we get 2 with a remainder of 246.
Write down 2 as next digit of the result. 
Result so far: 142.0
Subtracting 798 from 1044 leaves us with 246.
Bring next digit (9) of the dividend behind the 246 and repeat the process: 2469 / 399

On to step 6:
When dividing 2469 by 399, we get 6 with a remainder of 75.
Put 6 as the next digit of the answer. 
Result so far: 1426.0
If we take 2394 away from 2469, we end up with 75.
Fetch the next digit (8) from the dividend, attach it to 75 and continue: 758 / 399

Advancing to step 7:
399 can be fit into 758 1 times, resulting in a remainder of 359.
Put 1 as the next digit of the answer. 
Result so far: 14261.0
If we take 399 away from 758, we end up with 359.
Take the next digit (7) from the dividend and append it to 359, then repeat: 3597 / 399

Step 8:
399 can be fit into 3597 9 times, resulting in a remainder of 6.
Write down 9 as next digit of the result. 
Result so far: 142619.0
Deduct 3591 from 3597 and we're left with 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Advancing to step 9:
If we divide 60 by 399, we get 0 and a remainder of 60.
Use 0 as the next digit of our solution. 
Result so far: 142619.0
If we take 0 away from 60, we end up with 60.
Since there are no more digits in the dividend, we add a zero to the remainder making it 600, and continue the process.

Advancing to step 10:
600 divided by 399 is 1 with a remainder of 201.
Record the quotient 1 as the next digit in the result. 
Result so far: 142619.01
Subtracting 399 from 600 leaves us with 201.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2010, and continue the process.

Let's proceed to step 11:
If we divide 2010 by 399, we get 5 and a remainder of 15.
Put 5 as the next digit of the answer. 
Result so far: 142619.015
If we take 1995 away from 2010, we end up with 15.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

Moving on to step 12:
If we divide 150 by 399, we get 0 and a remainder of 150.
Use 0 as the next digit of our solution. 
Result so far: 142619.015
If we subtract 0 from 150, we get 150.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1500, and continue the process.

Advancing to step 13:
When dividing 1500 by 399, we get 3 with a remainder of 303.
The next digit of our result is 3. 
Result so far: 142619.01503
The remainder is 303 after subtracting 1197 from 1500.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3030, and continue the process.

Moving on to step 14:
399 can be fit into 3030 7 times, resulting in a remainder of 237.
The number 7 becomes the next digit in our result. 
Result so far: 142619.015037
Subtract 2793 from 3030 to get 237.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2370, and continue the process.

On to step 15:
399 can be fit into 2370 5 times, resulting in a remainder of 375.
Use 5 as the next digit of our solution. 
Result so far: 142619.0150375
Subtract 1995 from 2370 to get 375.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3750, and continue the process.

Advancing to step 16:
When dividing 3750 by 399, we get 9 with a remainder of 159.
The number 9 becomes the next digit in our result. 
Result so far: 142619.01503759
Subtracting 3591 from 3750 leaves us with 159.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1590, and continue the process.

In conclusion, the division gives 142619.01503759 with a balance of 1.59e-07.