We're dividing 4090 by 91 
The aim is to understand the frequency of 91 in 4090.

Let's proceed to step 1:
If we divide 4 by 91, we get 0 and a remainder of 4.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtract 0 from 4 to get 4.
Take the next digit (0) from the dividend and append it to 4, then repeat: 40 / 91

On to step 2:
91 goes into 40 0 times with a remainder of 40.
The next digit of our result is 0. 
Result so far: 0.0
If we subtract 0 from 40, we get 40.
Bring next digit (9) of the dividend behind the 40 and repeat the process: 409 / 91

On to step 3:
91 goes into 409 4 times with a remainder of 45.
Write down 4 as next digit of the result. 
Result so far: 4.0
Subtract 364 from 409 to get 45.
Take the next digit (0) from the dividend and append it to 45, then repeat: 450 / 91

Advancing to step 4:
When dividing 450 by 91, we get 4 with a remainder of 86.
Write down 4 as next digit of the result. 
Result so far: 44.0
If we take 364 away from 450, we end up with 86.
Since there are no more digits in the dividend, we add a zero to the remainder making it 860, and continue the process.

On to step 5:
If we divide 860 by 91, we get 9 and a remainder of 41.
The number 9 becomes the next digit in our result. 
Result so far: 44.9
If we take 819 away from 860, we end up with 41.
Since there are no more digits in the dividend, we add a zero to the remainder making it 410, and continue the process.

Let's proceed to step 6:
91 goes into 410 4 times with a remainder of 46.
Record the quotient 4 as the next digit in the result. 
Result so far: 44.94
Subtracting 364 from 410 leaves us with 46.
Since there are no more digits in the dividend, we add a zero to the remainder making it 460, and continue the process.

On to step 7:
The number 91 fits into 460 5 times, leaving a remainder of 5.
Use 5 as the next digit of our solution. 
Result so far: 44.945
Deduct 455 from 460 and we're left with 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

Step 8:
91 goes into 50 0 times with a remainder of 50.
The number 0 becomes the next digit in our result. 
Result so far: 44.945
If we subtract 0 from 50, we get 50.
Since there are no more digits in the dividend, we add a zero to the remainder making it 500, and continue the process.

Going ahead to step 9:
500 divided by 91 is 5 with a remainder of 45.
Write down 5 as next digit of the result. 
Result so far: 44.94505
If we subtract 455 from 500, we get 45.
Since there are no more digits in the dividend, we add a zero to the remainder making it 450, and continue the process.

Going ahead to step 10:
450 divided by 91 is 4 with a remainder of 86.
Write down 4 as next digit of the result. 
Result so far: 44.945054
Deduct 364 from 450 and we're left with 86.
Since there are no more digits in the dividend, we add a zero to the remainder making it 860, and continue the process.

On to step 11:
When dividing 860 by 91, we get 9 with a remainder of 41.
The number 9 becomes the next digit in our result. 
Result so far: 44.9450549
If we subtract 819 from 860, we get 41.
Since there are no more digits in the dividend, we add a zero to the remainder making it 410, and continue the process.

Step 12:
91 can be fit into 410 4 times, resulting in a remainder of 46.
Put 4 as the next digit of the answer. 
Result so far: 44.94505494
The remainder is 46 after subtracting 364 from 410.
Since there are no more digits in the dividend, we add a zero to the remainder making it 460, and continue the process.

In conclusion, the division gives 44.94505494 with a balance of 4.6e-08.