We look at the division of 78604487 by 999 
We want to divide 78604487 by 999.

Going ahead to step 1:
999 goes into 7 0 times with a remainder of 7.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtracting 0 from 7 leaves us with 7.
Fetch the next digit (8) from the dividend, attach it to 7 and continue: 78 / 999

Moving on to step 2:
999 goes into 78 0 times with a remainder of 78.
The next digit of our result is 0. 
Result so far: 0.0
The remainder is 78 after subtracting 0 from 78.
Grab the next digit (6) from the dividend, add it to 78, then carry on: 786 / 999

On to step 3:
999 can be fit into 786 0 times, resulting in a remainder of 786.
The next digit of our result is 0. 
Result so far: 0.0
Subtracting 0 from 786 leaves us with 786.
Bring next digit (0) of the dividend behind the 786 and repeat the process: 7860 / 999

Advancing to step 4:
If we divide 7860 by 999, we get 7 and a remainder of 867.
The number 7 becomes the next digit in our result. 
Result so far: 7.0
The remainder is 867 after subtracting 6993 from 7860.
Take the next digit (4) from the dividend and append it to 867, then repeat: 8674 / 999

Step 5:
If we divide 8674 by 999, we get 8 and a remainder of 682.
The number 8 becomes the next digit in our result. 
Result so far: 78.0
Subtracting 7992 from 8674 leaves us with 682.
Bring next digit (4) of the dividend behind the 682 and repeat the process: 6824 / 999

Moving on to step 6:
999 can be fit into 6824 6 times, resulting in a remainder of 830.
The number 6 becomes the next digit in our result. 
Result so far: 786.0
Deduct 5994 from 6824 and we're left with 830.
Append the next digit (8) from the dividend to 830 and continue with: 8308 / 999

Advancing to step 7:
999 goes into 8308 8 times with a remainder of 316.
The number 8 becomes the next digit in our result. 
Result so far: 7868.0
The remainder is 316 after subtracting 7992 from 8308.
Fetch the next digit (7) from the dividend, attach it to 316 and continue: 3167 / 999

Advancing to step 8:
999 can be fit into 3167 3 times, resulting in a remainder of 170.
Put 3 as the next digit of the answer. 
Result so far: 78683.0
If we take 2997 away from 3167, we end up with 170.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1700, and continue the process.

On to step 9:
When dividing 1700 by 999, we get 1 with a remainder of 701.
The number 1 becomes the next digit in our result. 
Result so far: 78683.1
The remainder is 701 after subtracting 999 from 1700.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7010, and continue the process.

Going ahead to step 10:
The number 999 fits into 7010 7 times, leaving a remainder of 17.
Put 7 as the next digit of the answer. 
Result so far: 78683.17
Deduct 6993 from 7010 and we're left with 17.
Since there are no more digits in the dividend, we add a zero to the remainder making it 170, and continue the process.

Moving on to step 11:
When dividing 170 by 999, we get 0 with a remainder of 170.
The number 0 becomes the next digit in our result. 
Result so far: 78683.17
Deduct 0 from 170 and we're left with 170.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1700, and continue the process.

On to step 12:
If we divide 1700 by 999, we get 1 and a remainder of 701.
Write down 1 as next digit of the result. 
Result so far: 78683.1701
If we subtract 999 from 1700, we get 701.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7010, and continue the process.

Going ahead to step 13:
The number 999 fits into 7010 7 times, leaving a remainder of 17.
The number 7 becomes the next digit in our result. 
Result so far: 78683.17017
The remainder is 17 after subtracting 6993 from 7010.
Since there are no more digits in the dividend, we add a zero to the remainder making it 170, and continue the process.

Moving on to step 14:
If we divide 170 by 999, we get 0 and a remainder of 170.
Use 0 as the next digit of our solution. 
Result so far: 78683.17017
Deduct 0 from 170 and we're left with 170.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1700, and continue the process.

Let's proceed to step 15:
999 can be fit into 1700 1 times, resulting in a remainder of 701.
The next digit of our result is 1. 
Result so far: 78683.1701701
Deduct 999 from 1700 and we're left with 701.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7010, and continue the process.

On to step 16:
If we divide 7010 by 999, we get 7 and a remainder of 17.
The next digit of our result is 7. 
Result so far: 78683.17017017
If we subtract 6993 from 7010, we get 17.
Since there are no more digits in the dividend, we add a zero to the remainder making it 170, and continue the process.

Our division results in 78683.17017017 with a remaining 1.7e-08.