Let's divide 172689 by 87
We want to divide 172689 by 87.

Going ahead to step 1:
When dividing 1 by 87, we get 0 with a remainder of 1.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
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 / 87

Let's proceed to step 2:
If we divide 17 by 87, we get 0 and a remainder of 17.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we take 0 away from 17, we end up with 17.
Bring next digit (2) of the dividend behind the 17 and repeat the process: 172 / 87

On to step 3:
If we divide 172 by 87, we get 1 and a remainder of 85.
The next digit of our result is 1. 
Result so far: 1.0
Deduct 87 from 172 and we're left with 85.
Include the next digit (6) from the dividend after 85, then repeat: 856 / 87

Going ahead to step 4:
87 can be fit into 856 9 times, resulting in a remainder of 73.
Use 9 as the next digit of our solution. 
Result so far: 19.0
Subtracting 783 from 856 leaves us with 73.
Fetch the next digit (8) from the dividend, attach it to 73 and continue: 738 / 87

On to step 5:
87 goes into 738 8 times with a remainder of 42.
Use 8 as the next digit of our solution. 
Result so far: 198.0
Subtracting 696 from 738 leaves us with 42.
Include the next digit (9) from the dividend after 42, then repeat: 429 / 87

Advancing to step 6:
If we divide 429 by 87, we get 4 and a remainder of 81.
Write down 4 as next digit of the result. 
Result so far: 1984.0
Subtract 348 from 429 to get 81.
Since there are no more digits in the dividend, we add a zero to the remainder making it 810, and continue the process.

Let's proceed to step 7:
87 goes into 810 9 times with a remainder of 27.
Use 9 as the next digit of our solution. 
Result so far: 1984.9
If we take 783 away from 810, we end up with 27.
Since there are no more digits in the dividend, we add a zero to the remainder making it 270, and continue the process.

Step 8:
87 can be fit into 270 3 times, resulting in a remainder of 9.
The next digit of our result is 3. 
Result so far: 1984.93
Deduct 261 from 270 and we're left with 9.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

Let's proceed to step 9:
90 divided by 87 is 1 with a remainder of 3.
The next digit of our result is 1. 
Result so far: 1984.931
Deduct 87 from 90 and we're left with 3.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

Let's proceed to step 10:
The number 87 fits into 30 0 times, leaving a remainder of 30.
The next digit of our result is 0. 
Result so far: 1984.931
If we take 0 away from 30, we end up with 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

Step 11:
87 goes into 300 3 times with a remainder of 39.
Record the quotient 3 as the next digit in the result. 
Result so far: 1984.93103
Deduct 261 from 300 and we're left 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.

Let's proceed to step 12:
390 divided by 87 is 4 with a remainder of 42.
Write down 4 as next digit of the result. 
Result so far: 1984.931034
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.

Step 13:
The number 87 fits into 420 4 times, leaving a remainder of 72.
Write down 4 as next digit of the result. 
Result so far: 1984.9310344
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 1984.9310344, with a leftover of 7.2e-07.