We look at the division of 128717 by 39 
Our goal is to divide 128717 by 39.

Advancing to step 1:
39 goes into 1 0 times with a remainder of 1.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtracting 0 from 1 leaves us with 1.
Fetch the next digit (2) from the dividend, attach it to 1 and continue: 12 / 39

Let's proceed to step 2:
If we divide 12 by 39, we get 0 and a remainder of 12.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
The remainder is 12 after subtracting 0 from 12.
Append the next digit (8) from the dividend to 12 and continue with: 128 / 39

Step 3:
When dividing 128 by 39, we get 3 with a remainder of 11.
Put 3 as the next digit of the answer. 
Result so far: 3.0
Deduct 117 from 128 and we're left with 11.
Fetch the next digit (7) from the dividend, attach it to 11 and continue: 117 / 39

Advancing to step 4:
When dividing 117 by 39, we get 3 with a remainder of 0.
The number 3 becomes the next digit in our result. 
Result so far: 33.0
If we subtract 117 from 117, we get 0.
Fetch the next digit (1) from the dividend, attach it to 0 and continue: 1 / 39

Step 5:
When dividing 1 by 39, we get 0 with a remainder of 1.
Record the quotient 0 as the next digit in the result. 
Result so far: 330.0
Deduct 0 from 1 and we're left with 1.
Take the next digit (7) from the dividend and append it to 1, then repeat: 17 / 39

Advancing to step 6:
If we divide 17 by 39, we get 0 and a remainder of 17.
Put 0 as the next digit of the answer. 
Result so far: 3300.0
Subtracting 0 from 17 leaves us 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.

Let's proceed to step 7:
If we divide 170 by 39, we get 4 and a remainder of 14.
Put 4 as the next digit of the answer. 
Result so far: 3300.4
The remainder is 14 after subtracting 156 from 170.
Since there are no more digits in the dividend, we add a zero to the remainder making it 140, and continue the process.

Going ahead to step 8:
If we divide 140 by 39, we get 3 and a remainder of 23.
Use 3 as the next digit of our solution. 
Result so far: 3300.43
Subtract 117 from 140 to get 23.
Since there are no more digits in the dividend, we add a zero to the remainder making it 230, and continue the process.

Moving on to step 9:
39 goes into 230 5 times with a remainder of 35.
The next digit of our result is 5. 
Result so far: 3300.435
Deduct 195 from 230 and we're left with 35.
Since there are no more digits in the dividend, we add a zero to the remainder making it 350, and continue the process.

Step 10:
39 can be fit into 350 8 times, resulting in a remainder of 38.
Record the quotient 8 as the next digit in the result. 
Result so far: 3300.4358
Subtract 312 from 350 to get 38.
Since there are no more digits in the dividend, we add a zero to the remainder making it 380, and continue the process.

Step 11:
When dividing 380 by 39, we get 9 with a remainder of 29.
Put 9 as the next digit of the answer. 
Result so far: 3300.43589
The remainder is 29 after subtracting 351 from 380.
Since there are no more digits in the dividend, we add a zero to the remainder making it 290, and continue the process.

Let's proceed to step 12:
When dividing 290 by 39, we get 7 with a remainder of 17.
Put 7 as the next digit of the answer. 
Result so far: 3300.435897
If we subtract 273 from 290, 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.

Going ahead to step 13:
If we divide 170 by 39, we get 4 and a remainder of 14.
Put 4 as the next digit of the answer. 
Result so far: 3300.4358974
Subtract 156 from 170 to get 14.
Since there are no more digits in the dividend, we add a zero to the remainder making it 140, and continue the process.

Step 14:
If we divide 140 by 39, we get 3 and a remainder of 23.
Write down 3 as next digit of the result. 
Result so far: 3300.43589743
Subtract 117 from 140 to get 23.
Since there are no more digits in the dividend, we add a zero to the remainder making it 230, and continue the process.

The final result is 3300.43589743 with a remainder of 2.3e-08.