We're dividing 12172874 by 991 
Our goal is to divide 12172874 by 991.

Going ahead to step 1:
When dividing 1 by 991, we get 0 with a remainder of 1.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we take 0 away from 1, we end up with 1.
Grab the next digit (2) from the dividend, add it to 1, then carry on: 12 / 991

Step 2:
991 can be fit into 12 0 times, resulting in a remainder of 12.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtracting 0 from 12 leaves us with 12.
Append the next digit (1) from the dividend to 12 and continue with: 121 / 991

On to step 3:
121 divided by 991 is 0 with a remainder of 121.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Deduct 0 from 121 and we're left with 121.
Grab the next digit (7) from the dividend, add it to 121, then carry on: 1217 / 991

Advancing to step 4:
991 can be fit into 1217 1 times, resulting in a remainder of 226.
Record the quotient 1 as the next digit in the result. 
Result so far: 1.0
Deduct 991 from 1217 and we're left with 226.
Grab the next digit (2) from the dividend, add it to 226, then carry on: 2262 / 991

Let's proceed to step 5:
2262 divided by 991 is 2 with a remainder of 280.
Record the quotient 2 as the next digit in the result. 
Result so far: 12.0
If we subtract 1982 from 2262, we get 280.
Bring next digit (8) of the dividend behind the 280 and repeat the process: 2808 / 991

Let's proceed to step 6:
The number 991 fits into 2808 2 times, leaving a remainder of 826.
The next digit of our result is 2. 
Result so far: 122.0
Subtracting 1982 from 2808 leaves us with 826.
Fetch the next digit (7) from the dividend, attach it to 826 and continue: 8267 / 991

Moving on to step 7:
The number 991 fits into 8267 8 times, leaving a remainder of 339.
Use 8 as the next digit of our solution. 
Result so far: 1228.0
Subtract 7928 from 8267 to get 339.
Grab the next digit (4) from the dividend, add it to 339, then carry on: 3394 / 991

Going ahead to step 8:
991 can be fit into 3394 3 times, resulting in a remainder of 421.
The number 3 becomes the next digit in our result. 
Result so far: 12283.0
If we subtract 2973 from 3394, we get 421.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4210, and continue the process.

Moving on to step 9:
4210 divided by 991 is 4 with a remainder of 246.
Write down 4 as next digit of the result. 
Result so far: 12283.4
Deduct 3964 from 4210 and we're left with 246.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2460, and continue the process.

Step 10:
If we divide 2460 by 991, we get 2 and a remainder of 478.
Use 2 as the next digit of our solution. 
Result so far: 12283.42
If we subtract 1982 from 2460, we get 478.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4780, and continue the process.

Going ahead to step 11:
991 can be fit into 4780 4 times, resulting in a remainder of 816.
The next digit of our result is 4. 
Result so far: 12283.424
If we subtract 3964 from 4780, we get 816.
Since there are no more digits in the dividend, we add a zero to the remainder making it 8160, and continue the process.

Going ahead to step 12:
991 goes into 8160 8 times with a remainder of 232.
Write down 8 as next digit of the result. 
Result so far: 12283.4248
If we take 7928 away from 8160, we end up with 232.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2320, and continue the process.

On to step 13:
When dividing 2320 by 991, we get 2 with a remainder of 338.
The next digit of our result is 2. 
Result so far: 12283.42482
Subtract 1982 from 2320 to get 338.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3380, and continue the process.

Let's proceed to step 14:
When dividing 3380 by 991, we get 3 with a remainder of 407.
Use 3 as the next digit of our solution. 
Result so far: 12283.424823
Subtract 2973 from 3380 to get 407.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4070, and continue the process.

Going ahead to step 15:
991 can be fit into 4070 4 times, resulting in a remainder of 106.
Record the quotient 4 as the next digit in the result. 
Result so far: 12283.4248234
If we take 3964 away from 4070, we end up with 106.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1060, and continue the process.

Step 16:
991 can be fit into 1060 1 times, resulting in a remainder of 69.
Put 1 as the next digit of the answer. 
Result so far: 12283.42482341
Subtract 991 from 1060 to get 69.
Since there are no more digits in the dividend, we add a zero to the remainder making it 690, and continue the process.

The final result is 12283.42482341 with a remainder of 6.9e-08.