We look at the division of 91387221 by 284 
We want to figure out the number of times 91387221 can be divided by 284.

Advancing to step 1:
When dividing 9 by 284, we get 0 with a remainder of 9.
The next digit of our result is 0. 
Result so far: 0.0
If we subtract 0 from 9, we get 9.
Include the next digit (1) from the dividend after 9, then repeat: 91 / 284

On to step 2:
If we divide 91 by 284, we get 0 and a remainder of 91.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtract 0 from 91 to get 91.
Append the next digit (3) from the dividend to 91 and continue with: 913 / 284

Going ahead to step 3:
When dividing 913 by 284, we get 3 with a remainder of 61.
The next digit of our result is 3. 
Result so far: 3.0
If we take 852 away from 913, we end up with 61.
Include the next digit (8) from the dividend after 61, then repeat: 618 / 284

Advancing to step 4:
284 can be fit into 618 2 times, resulting in a remainder of 50.
Use 2 as the next digit of our solution. 
Result so far: 32.0
The remainder is 50 after subtracting 568 from 618.
Fetch the next digit (7) from the dividend, attach it to 50 and continue: 507 / 284

On to step 5:
507 divided by 284 is 1 with a remainder of 223.
Put 1 as the next digit of the answer. 
Result so far: 321.0
Deduct 284 from 507 and we're left with 223.
Grab the next digit (2) from the dividend, add it to 223, then carry on: 2232 / 284

Let's proceed to step 6:
284 goes into 2232 7 times with a remainder of 244.
The next digit of our result is 7. 
Result so far: 3217.0
Deduct 1988 from 2232 and we're left with 244.
Include the next digit (2) from the dividend after 244, then repeat: 2442 / 284

Going ahead to step 7:
2442 divided by 284 is 8 with a remainder of 170.
The number 8 becomes the next digit in our result. 
Result so far: 32178.0
If we take 2272 away from 2442, we end up with 170.
Bring next digit (1) of the dividend behind the 170 and repeat the process: 1701 / 284

On to step 8:
If we divide 1701 by 284, we get 5 and a remainder of 281.
Use 5 as the next digit of our solution. 
Result so far: 321785.0
If we take 1420 away from 1701, we end up with 281.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2810, and continue the process.

On to step 9:
284 goes into 2810 9 times with a remainder of 254.
Use 9 as the next digit of our solution. 
Result so far: 321785.9
If we subtract 2556 from 2810, we get 254.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2540, and continue the process.

On to step 10:
284 can be fit into 2540 8 times, resulting in a remainder of 268.
Record the quotient 8 as the next digit in the result. 
Result so far: 321785.98
Deduct 2272 from 2540 and we're left with 268.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2680, and continue the process.

Going ahead to step 11:
The number 284 fits into 2680 9 times, leaving a remainder of 124.
Put 9 as the next digit of the answer. 
Result so far: 321785.989
Deduct 2556 from 2680 and we're left with 124.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1240, and continue the process.

Step 12:
If we divide 1240 by 284, we get 4 and a remainder of 104.
The number 4 becomes the next digit in our result. 
Result so far: 321785.9894
The remainder is 104 after subtracting 1136 from 1240.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1040, and continue the process.

Advancing to step 13:
If we divide 1040 by 284, we get 3 and a remainder of 188.
The next digit of our result is 3. 
Result so far: 321785.98943
If we subtract 852 from 1040, we get 188.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1880, and continue the process.

On to step 14:
1880 divided by 284 is 6 with a remainder of 176.
The next digit of our result is 6. 
Result so far: 321785.989436
If we take 1704 away from 1880, we end up with 176.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1760, and continue the process.

Step 15:
284 can be fit into 1760 6 times, resulting in a remainder of 56.
The next digit of our result is 6. 
Result so far: 321785.9894366
If we subtract 1704 from 1760, we get 56.
Since there are no more digits in the dividend, we add a zero to the remainder making it 560, and continue the process.

The final result is 321785.9894366 with a remainder of 5.6e-07.