We're dividing 557237 by 15 
The aim is to understand the frequency of 15 in 557237.

Step 1:
15 goes into 5 0 times with a remainder of 5.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtract 0 from 5 to get 5.
Bring next digit (5) of the dividend behind the 5 and repeat the process: 55 / 15

Step 2:
When dividing 55 by 15, we get 3 with a remainder of 10.
The number 3 becomes the next digit in our result. 
Result so far: 3.0
The remainder is 10 after subtracting 45 from 55.
Bring next digit (7) of the dividend behind the 10 and repeat the process: 107 / 15

Moving on to step 3:
The number 15 fits into 107 7 times, leaving a remainder of 2.
Use 7 as the next digit of our solution. 
Result so far: 37.0
Subtracting 105 from 107 leaves us with 2.
Append the next digit (2) from the dividend to 2 and continue with: 22 / 15

Moving on to step 4:
15 can be fit into 22 1 times, resulting in a remainder of 7.
Put 1 as the next digit of the answer. 
Result so far: 371.0
If we take 15 away from 22, we end up with 7.
Fetch the next digit (3) from the dividend, attach it to 7 and continue: 73 / 15

Step 5:
15 can be fit into 73 4 times, resulting in a remainder of 13.
Use 4 as the next digit of our solution. 
Result so far: 3714.0
Subtract 60 from 73 to get 13.
Take the next digit (7) from the dividend and append it to 13, then repeat: 137 / 15

On to step 6:
137 divided by 15 is 9 with a remainder of 2.
The next digit of our result is 9. 
Result so far: 37149.0
Subtract 135 from 137 to get 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Let's proceed to step 7:
15 can be fit into 20 1 times, resulting in a remainder of 5.
Put 1 as the next digit of the answer. 
Result so far: 37149.1
If we take 15 away from 20, we end up 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.

Let's proceed to step 8:
15 goes into 50 3 times with a remainder of 5.
Write down 3 as next digit of the result. 
Result so far: 37149.13
Subtracting 45 from 50 leaves us 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.

Going ahead to step 9:
The number 15 fits into 50 3 times, leaving a remainder of 5.
Put 3 as the next digit of the answer. 
Result so far: 37149.133
Deduct 45 from 50 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.

After the division, we end up with 37149.133 and a remainder of 0.0005.