We're dividing 170907 by 87 
We're looking to find how many times 87 goes into 170907.

Advancing to step 1:
When dividing 1 by 87, we get 0 with a remainder of 1.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we subtract 0 from 1, we get 1.
Include the next digit (7) from the dividend after 1, then repeat: 17 / 87

Moving on to step 2:
87 can be fit into 17 0 times, resulting in a remainder of 17.
The next digit of our result is 0. 
Result so far: 0.0
The remainder is 17 after subtracting 0 from 17.
Fetch the next digit (0) from the dividend, attach it to 17 and continue: 170 / 87

Moving on to step 3:
If we divide 170 by 87, we get 1 and a remainder of 83.
The next digit of our result is 1. 
Result so far: 1.0
If we take 87 away from 170, we end up with 83.
Fetch the next digit (9) from the dividend, attach it to 83 and continue: 839 / 87

Advancing to step 4:
The number 87 fits into 839 9 times, leaving a remainder of 56.
The next digit of our result is 9. 
Result so far: 19.0
If we subtract 783 from 839, we get 56.
Fetch the next digit (0) from the dividend, attach it to 56 and continue: 560 / 87

On to step 5:
The number 87 fits into 560 6 times, leaving a remainder of 38.
The number 6 becomes the next digit in our result. 
Result so far: 196.0
If we subtract 522 from 560, we get 38.
Take the next digit (7) from the dividend and append it to 38, then repeat: 387 / 87

Advancing to step 6:
The number 87 fits into 387 4 times, leaving a remainder of 39.
The next digit of our result is 4. 
Result so far: 1964.0
Subtracting 348 from 387 leaves us with 39.
Since there are no more digits in the dividend, we add a zero to the remainder making it 390, and continue the process.

Moving on to step 7:
The number 87 fits into 390 4 times, leaving a remainder of 42.
Put 4 as the next digit of the answer. 
Result so far: 1964.4
The remainder is 42 after subtracting 348 from 390.
Since there are no more digits in the dividend, we add a zero to the remainder making it 420, and continue the process.

Going ahead to step 8:
If we divide 420 by 87, we get 4 and a remainder of 72.
Write down 4 as next digit of the result. 
Result so far: 1964.44
Deduct 348 from 420 and we're left with 72.
Since there are no more digits in the dividend, we add a zero to the remainder making it 720, and continue the process.

The final outcome is 1964.44, with a leftover of 0.072.