We're dividing 172980 by 91 
Let's see how many times 91 fits into 172980.

On to step 1:
91 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.
Include the next digit (7) from the dividend after 1, then repeat: 17 / 91

Moving on to step 2:
If we divide 17 by 91, we get 0 and a remainder of 17.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtract 0 from 17 to get 17.
Append the next digit (2) from the dividend to 17 and continue with: 172 / 91

Step 3:
If we divide 172 by 91, we get 1 and a remainder of 81.
Use 1 as the next digit of our solution. 
Result so far: 1.0
The remainder is 81 after subtracting 91 from 172.
Grab the next digit (9) from the dividend, add it to 81, then carry on: 819 / 91

Going ahead to step 4:
When dividing 819 by 91, we get 9 with a remainder of 0.
Write down 9 as next digit of the result. 
Result so far: 19.0
If we take 819 away from 819, we end up with 0.
Include the next digit (8) from the dividend after 0, then repeat: 8 / 91

Advancing to step 5:
91 goes into 8 0 times with a remainder of 8.
Put 0 as the next digit of the answer. 
Result so far: 190.0
If we subtract 0 from 8, we get 8.
Append the next digit (0) from the dividend to 8 and continue with: 80 / 91

On to step 6:
If we divide 80 by 91, we get 0 and a remainder of 80.
Write down 0 as next digit of the result. 
Result so far: 1900.0
The remainder is 80 after subtracting 0 from 80.
Since there are no more digits in the dividend, we add a zero to the remainder making it 800, and continue the process.

Moving on to step 7:
91 can be fit into 800 8 times, resulting in a remainder of 72.
The next digit of our result is 8. 
Result so far: 1900.8
Deduct 728 from 800 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.

Moving on to step 8:
The number 91 fits into 720 7 times, leaving a remainder of 83.
Put 7 as the next digit of the answer. 
Result so far: 1900.87
If we subtract 637 from 720, we get 83.
Since there are no more digits in the dividend, we add a zero to the remainder making it 830, and continue the process.

Let's proceed to step 9:
91 can be fit into 830 9 times, resulting in a remainder of 11.
The number 9 becomes the next digit in our result. 
Result so far: 1900.879
If we subtract 819 from 830, we get 11.
Since there are no more digits in the dividend, we add a zero to the remainder making it 110, and continue the process.

Let's proceed to step 10:
When dividing 110 by 91, we get 1 with a remainder of 19.
Put 1 as the next digit of the answer. 
Result so far: 1900.8791
Deduct 91 from 110 and we're left with 19.
Since there are no more digits in the dividend, we add a zero to the remainder making it 190, and continue the process.

On to step 11:
91 can be fit into 190 2 times, resulting in a remainder of 8.
Put 2 as the next digit of the answer. 
Result so far: 1900.87912
Subtract 182 from 190 to get 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Step 12:
When dividing 80 by 91, we get 0 with a remainder of 80.
Put 0 as the next digit of the answer. 
Result so far: 1900.87912
If we subtract 0 from 80, we get 80.
Since there are no more digits in the dividend, we add a zero to the remainder making it 800, and continue the process.

Let's proceed to step 13:
The number 91 fits into 800 8 times, leaving a remainder of 72.
Record the quotient 8 as the next digit in the result. 
Result so far: 1900.8791208
Subtract 728 from 800 to get 72.
Since there are no more digits in the dividend, we add a zero to the remainder making it 720, and continue the process.

On to step 14:
91 goes into 720 7 times with a remainder of 83.
Put 7 as the next digit of the answer. 
Result so far: 1900.87912087
The remainder is 83 after subtracting 637 from 720.
Since there are no more digits in the dividend, we add a zero to the remainder making it 830, and continue the process.

In conclusion, the division gives 1900.87912087 with a balance of 8.3e-08.