We're dividing 91312162 by 421 
We want to figure out the number of times 91312162 can be divided by 421.

Step 1:
421 goes into 9 0 times with a remainder of 9.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Deduct 0 from 9 and we're left with 9.
Take the next digit (1) from the dividend and append it to 9, then repeat: 91 / 421

Let's proceed to step 2:
421 goes into 91 0 times with a remainder of 91.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtract 0 from 91 to get 91.
Grab the next digit (3) from the dividend, add it to 91, then carry on: 913 / 421

Going ahead to step 3:
The number 421 fits into 913 2 times, leaving a remainder of 71.
Put 2 as the next digit of the answer. 
Result so far: 2.0
Subtracting 842 from 913 leaves us with 71.
Bring next digit (1) of the dividend behind the 71 and repeat the process: 711 / 421

Advancing to step 4:
If we divide 711 by 421, we get 1 and a remainder of 290.
The next digit of our result is 1. 
Result so far: 21.0
Subtract 421 from 711 to get 290.
Fetch the next digit (2) from the dividend, attach it to 290 and continue: 2902 / 421

Going ahead to step 5:
421 can be fit into 2902 6 times, resulting in a remainder of 376.
Write down 6 as next digit of the result. 
Result so far: 216.0
If we take 2526 away from 2902, we end up with 376.
Fetch the next digit (1) from the dividend, attach it to 376 and continue: 3761 / 421

On to step 6:
421 goes into 3761 8 times with a remainder of 393.
The next digit of our result is 8. 
Result so far: 2168.0
The remainder is 393 after subtracting 3368 from 3761.
Bring next digit (6) of the dividend behind the 393 and repeat the process: 3936 / 421

Advancing to step 7:
421 can be fit into 3936 9 times, resulting in a remainder of 147.
The number 9 becomes the next digit in our result. 
Result so far: 21689.0
Subtracting 3789 from 3936 leaves us with 147.
Include the next digit (2) from the dividend after 147, then repeat: 1472 / 421

On to step 8:
421 goes into 1472 3 times with a remainder of 209.
Record the quotient 3 as the next digit in the result. 
Result so far: 216893.0
The remainder is 209 after subtracting 1263 from 1472.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2090, and continue the process.

Advancing to step 9:
When dividing 2090 by 421, we get 4 with a remainder of 406.
The number 4 becomes the next digit in our result. 
Result so far: 216893.4
Subtract 1684 from 2090 to get 406.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4060, and continue the process.

Moving on to step 10:
421 can be fit into 4060 9 times, resulting in a remainder of 271.
Write down 9 as next digit of the result. 
Result so far: 216893.49
The remainder is 271 after subtracting 3789 from 4060.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2710, and continue the process.

On to step 11:
When dividing 2710 by 421, we get 6 with a remainder of 184.
The next digit of our result is 6. 
Result so far: 216893.496
If we take 2526 away from 2710, we end up with 184.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1840, and continue the process.

Step 12:
421 goes into 1840 4 times with a remainder of 156.
Write down 4 as next digit of the result. 
Result so far: 216893.4964
If we subtract 1684 from 1840, we get 156.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1560, and continue the process.

Let's proceed to step 13:
If we divide 1560 by 421, we get 3 and a remainder of 297.
Put 3 as the next digit of the answer. 
Result so far: 216893.49643
If we take 1263 away from 1560, we end up with 297.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2970, and continue the process.

Going ahead to step 14:
421 goes into 2970 7 times with a remainder of 23.
The number 7 becomes the next digit in our result. 
Result so far: 216893.496437
Subtracting 2947 from 2970 leaves us with 23.
Since there are no more digits in the dividend, we add a zero to the remainder making it 230, and continue the process.

Advancing to step 15:
When dividing 230 by 421, we get 0 with a remainder of 230.
Put 0 as the next digit of the answer. 
Result so far: 216893.496437
Deduct 0 from 230 and we're left with 230.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2300, and continue the process.

On to step 16:
The number 421 fits into 2300 5 times, leaving a remainder of 195.
Use 5 as the next digit of our solution. 
Result so far: 216893.49643705
Deduct 2105 from 2300 and we're left with 195.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1950, and continue the process.

The final outcome is 216893.49643705, with a leftover of 1.95e-07.