We look at the division of 491755 by 15 
The aim is to understand the frequency of 15 in 491755.

Step 1:
15 goes into 4 0 times with a remainder of 4.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we subtract 0 from 4, we get 4.
Take the next digit (9) from the dividend and append it to 4, then repeat: 49 / 15

Advancing to step 2:
49 divided by 15 is 3 with a remainder of 4.
The next digit of our result is 3. 
Result so far: 3.0
If we subtract 45 from 49, we get 4.
Grab the next digit (1) from the dividend, add it to 4, then carry on: 41 / 15

Going ahead to step 3:
15 goes into 41 2 times with a remainder of 11.
Record the quotient 2 as the next digit in the result. 
Result so far: 32.0
The remainder is 11 after subtracting 30 from 41.
Bring next digit (7) of the dividend behind the 11 and repeat the process: 117 / 15

Let's proceed to step 4:
The number 15 fits into 117 7 times, leaving a remainder of 12.
Put 7 as the next digit of the answer. 
Result so far: 327.0
The remainder is 12 after subtracting 105 from 117.
Take the next digit (5) from the dividend and append it to 12, then repeat: 125 / 15

Moving on to step 5:
15 can be fit into 125 8 times, resulting in a remainder of 5.
Write down 8 as next digit of the result. 
Result so far: 3278.0
Subtract 120 from 125 to get 5.
Bring next digit (5) of the dividend behind the 5 and repeat the process: 55 / 15

Moving on to step 6:
When dividing 55 by 15, we get 3 with a remainder of 10.
Write down 3 as next digit of the result. 
Result so far: 32783.0
The remainder is 10 after subtracting 45 from 55.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

On to step 7:
The number 15 fits into 100 6 times, leaving a remainder of 10.
Write down 6 as next digit of the result. 
Result so far: 32783.6
If we take 90 away from 100, we end up with 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Step 8:
100 divided by 15 is 6 with a remainder of 10.
Put 6 as the next digit of the answer. 
Result so far: 32783.66
Subtracting 90 from 100 leaves us with 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

The final result is 32783.66 with a remainder of 0.01.