We look at the division of 639892 by 86 
We want to figure out the number of times 639892 can be divided by 86.

Moving on to step 1:
86 goes into 6 0 times with a remainder of 6.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtracting 0 from 6 leaves us with 6.
Grab the next digit (3) from the dividend, add it to 6, then carry on: 63 / 86

Advancing to step 2:
63 divided by 86 is 0 with a remainder of 63.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtract 0 from 63 to get 63.
Fetch the next digit (9) from the dividend, attach it to 63 and continue: 639 / 86

Advancing to step 3:
639 divided by 86 is 7 with a remainder of 37.
The number 7 becomes the next digit in our result. 
Result so far: 7.0
Deduct 602 from 639 and we're left with 37.
Grab the next digit (8) from the dividend, add it to 37, then carry on: 378 / 86

Moving on to step 4:
If we divide 378 by 86, we get 4 and a remainder of 34.
Use 4 as the next digit of our solution. 
Result so far: 74.0
If we subtract 344 from 378, we get 34.
Include the next digit (9) from the dividend after 34, then repeat: 349 / 86

Advancing to step 5:
86 can be fit into 349 4 times, resulting in a remainder of 5.
Put 4 as the next digit of the answer. 
Result so far: 744.0
If we subtract 344 from 349, we get 5.
Include the next digit (2) from the dividend after 5, then repeat: 52 / 86

Going ahead to step 6:
The number 86 fits into 52 0 times, leaving a remainder of 52.
Write down 0 as next digit of the result. 
Result so far: 7440.0
Deduct 0 from 52 and we're left with 52.
Since there are no more digits in the dividend, we add a zero to the remainder making it 520, and continue the process.

Moving on to step 7:
The number 86 fits into 520 6 times, leaving a remainder of 4.
The next digit of our result is 6. 
Result so far: 7440.6
The remainder is 4 after subtracting 516 from 520.
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:
40 divided by 86 is 0 with a remainder of 40.
The number 0 becomes the next digit in our result. 
Result so far: 7440.6
The remainder is 40 after subtracting 0 from 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

Advancing to step 9:
86 goes into 400 4 times with a remainder of 56.
The next digit of our result is 4. 
Result so far: 7440.604
Subtract 344 from 400 to get 56.
Since there are no more digits in the dividend, we add a zero to the remainder making it 560, and continue the process.

On to step 10:
86 goes into 560 6 times with a remainder of 44.
The number 6 becomes the next digit in our result. 
Result so far: 7440.6046
Subtracting 516 from 560 leaves us with 44.
Since there are no more digits in the dividend, we add a zero to the remainder making it 440, and continue the process.

On to step 11:
86 goes into 440 5 times with a remainder of 10.
Write down 5 as next digit of the result. 
Result so far: 7440.60465
Subtract 430 from 440 to get 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

On to step 12:
When dividing 100 by 86, we get 1 with a remainder of 14.
The number 1 becomes the next digit in our result. 
Result so far: 7440.604651
If we take 86 away from 100, we end up with 14.
Since there are no more digits in the dividend, we add a zero to the remainder making it 140, and continue the process.

On to step 13:
140 divided by 86 is 1 with a remainder of 54.
Write down 1 as next digit of the result. 
Result so far: 7440.6046511
Deduct 86 from 140 and we're left with 54.
Since there are no more digits in the dividend, we add a zero to the remainder making it 540, and continue the process.

The final result is 7440.6046511 with a remainder of 5.4e-07.