We're dividing 363693 by 91 
The aim is to understand the frequency of 91 in 363693.

On to step 1:
91 can be fit into 3 0 times, resulting in a remainder of 3.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
The remainder is 3 after subtracting 0 from 3.
Append the next digit (6) from the dividend to 3 and continue with: 36 / 91

Going ahead to step 2:
When dividing 36 by 91, we get 0 with a remainder of 36.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Deduct 0 from 36 and we're left with 36.
Take the next digit (3) from the dividend and append it to 36, then repeat: 363 / 91

Advancing to step 3:
If we divide 363 by 91, we get 3 and a remainder of 90.
Write down 3 as next digit of the result. 
Result so far: 3.0
Deduct 273 from 363 and we're left with 90.
Bring next digit (6) of the dividend behind the 90 and repeat the process: 906 / 91

Step 4:
When dividing 906 by 91, we get 9 with a remainder of 87.
The number 9 becomes the next digit in our result. 
Result so far: 39.0
If we subtract 819 from 906, we get 87.
Grab the next digit (9) from the dividend, add it to 87, then carry on: 879 / 91

Going ahead to step 5:
879 divided by 91 is 9 with a remainder of 60.
The next digit of our result is 9. 
Result so far: 399.0
If we take 819 away from 879, we end up with 60.
Take the next digit (3) from the dividend and append it to 60, then repeat: 603 / 91

Going ahead to step 6:
91 can be fit into 603 6 times, resulting in a remainder of 57.
Put 6 as the next digit of the answer. 
Result so far: 3996.0
The remainder is 57 after subtracting 546 from 603.
Since there are no more digits in the dividend, we add a zero to the remainder making it 570, and continue the process.

Let's proceed to step 7:
91 goes into 570 6 times with a remainder of 24.
Put 6 as the next digit of the answer. 
Result so far: 3996.6
If we subtract 546 from 570, we get 24.
Since there are no more digits in the dividend, we add a zero to the remainder making it 240, and continue the process.

Moving on to step 8:
91 goes into 240 2 times with a remainder of 58.
Use 2 as the next digit of our solution. 
Result so far: 3996.62
Deduct 182 from 240 and we're left with 58.
Since there are no more digits in the dividend, we add a zero to the remainder making it 580, and continue the process.

Moving on to step 9:
If we divide 580 by 91, we get 6 and a remainder of 34.
Record the quotient 6 as the next digit in the result. 
Result so far: 3996.626
Deduct 546 from 580 and we're left with 34.
Since there are no more digits in the dividend, we add a zero to the remainder making it 340, and continue the process.

Going ahead to step 10:
91 goes into 340 3 times with a remainder of 67.
Write down 3 as next digit of the result. 
Result so far: 3996.6263
The remainder is 67 after subtracting 273 from 340.
Since there are no more digits in the dividend, we add a zero to the remainder making it 670, and continue the process.

Moving on to step 11:
91 can be fit into 670 7 times, resulting in a remainder of 33.
Use 7 as the next digit of our solution. 
Result so far: 3996.62637
If we subtract 637 from 670, we get 33.
Since there are no more digits in the dividend, we add a zero to the remainder making it 330, and continue the process.

On to step 12:
91 goes into 330 3 times with a remainder of 57.
Record the quotient 3 as the next digit in the result. 
Result so far: 3996.626373
Subtracting 273 from 330 leaves us with 57.
Since there are no more digits in the dividend, we add a zero to the remainder making it 570, and continue the process.

Going ahead to step 13:
If we divide 570 by 91, we get 6 and a remainder of 24.
Put 6 as the next digit of the answer. 
Result so far: 3996.6263736
Deduct 546 from 570 and we're left with 24.
Since there are no more digits in the dividend, we add a zero to the remainder making it 240, and continue the process.

Going ahead to step 14:
If we divide 240 by 91, we get 2 and a remainder of 58.
The next digit of our result is 2. 
Result so far: 3996.62637362
Deduct 182 from 240 and we're left with 58.
Since there are no more digits in the dividend, we add a zero to the remainder making it 580, and continue the process.

The final outcome is 3996.62637362, with a leftover of 5.8e-08.