We're dividing 91231521 by 178 
We want to figure out the number of times 91231521 can be divided by 178.

Advancing to step 1:
178 goes into 9 0 times with a remainder of 9.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we subtract 0 from 9, we get 9.
Fetch the next digit (1) from the dividend, attach it to 9 and continue: 91 / 178

Going ahead to step 2:
178 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
If we subtract 0 from 91, we get 91.
Fetch the next digit (2) from the dividend, attach it to 91 and continue: 912 / 178

Let's proceed to step 3:
The number 178 fits into 912 5 times, leaving a remainder of 22.
The next digit of our result is 5. 
Result so far: 5.0
The remainder is 22 after subtracting 890 from 912.
Take the next digit (3) from the dividend and append it to 22, then repeat: 223 / 178

Advancing to step 4:
223 divided by 178 is 1 with a remainder of 45.
The next digit of our result is 1. 
Result so far: 51.0
If we subtract 178 from 223, we get 45.
Append the next digit (1) from the dividend to 45 and continue with: 451 / 178

Let's proceed to step 5:
The number 178 fits into 451 2 times, leaving a remainder of 95.
The next digit of our result is 2. 
Result so far: 512.0
If we subtract 356 from 451, we get 95.
Take the next digit (5) from the dividend and append it to 95, then repeat: 955 / 178

On to step 6:
The number 178 fits into 955 5 times, leaving a remainder of 65.
The next digit of our result is 5. 
Result so far: 5125.0
Subtracting 890 from 955 leaves us with 65.
Append the next digit (2) from the dividend to 65 and continue with: 652 / 178

Moving on to step 7:
178 goes into 652 3 times with a remainder of 118.
Record the quotient 3 as the next digit in the result. 
Result so far: 51253.0
Subtract 534 from 652 to get 118.
Bring next digit (1) of the dividend behind the 118 and repeat the process: 1181 / 178

Step 8:
178 can be fit into 1181 6 times, resulting in a remainder of 113.
Use 6 as the next digit of our solution. 
Result so far: 512536.0
If we subtract 1068 from 1181, we get 113.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1130, and continue the process.

Step 9:
When dividing 1130 by 178, we get 6 with a remainder of 62.
The next digit of our result is 6. 
Result so far: 512536.6
If we subtract 1068 from 1130, we get 62.
Since there are no more digits in the dividend, we add a zero to the remainder making it 620, and continue the process.

Let's proceed to step 10:
620 divided by 178 is 3 with a remainder of 86.
Record the quotient 3 as the next digit in the result. 
Result so far: 512536.63
If we subtract 534 from 620, we get 86.
Since there are no more digits in the dividend, we add a zero to the remainder making it 860, and continue the process.

Let's proceed to step 11:
860 divided by 178 is 4 with a remainder of 148.
The next digit of our result is 4. 
Result so far: 512536.634
Subtracting 712 from 860 leaves us with 148.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1480, and continue the process.

Going ahead to step 12:
178 can be fit into 1480 8 times, resulting in a remainder of 56.
The next digit of our result is 8. 
Result so far: 512536.6348
If we take 1424 away from 1480, we end up with 56.
Since there are no more digits in the dividend, we add a zero to the remainder making it 560, and continue the process.

On to step 13:
560 divided by 178 is 3 with a remainder of 26.
The next digit of our result is 3. 
Result so far: 512536.63483
If we take 534 away from 560, we end up with 26.
Since there are no more digits in the dividend, we add a zero to the remainder making it 260, and continue the process.

Advancing to step 14:
260 divided by 178 is 1 with a remainder of 82.
The number 1 becomes the next digit in our result. 
Result so far: 512536.634831
The remainder is 82 after subtracting 178 from 260.
Since there are no more digits in the dividend, we add a zero to the remainder making it 820, and continue the process.

Step 15:
820 divided by 178 is 4 with a remainder of 108.
Record the quotient 4 as the next digit in the result. 
Result so far: 512536.6348314
The remainder is 108 after subtracting 712 from 820.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1080, and continue the process.

Going ahead to step 16:
1080 divided by 178 is 6 with a remainder of 12.
Write down 6 as next digit of the result. 
Result so far: 512536.63483146
Subtracting 1068 from 1080 leaves us with 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

The final result is 512536.63483146 with a remainder of 1.2e-08.