We look at the division of 727291 by 57 
The aim is to understand the frequency of 57 in 727291.

On to step 1:
When dividing 7 by 57, we get 0 with a remainder of 7.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtracting 0 from 7 leaves us with 7.
Bring next digit (2) of the dividend behind the 7 and repeat the process: 72 / 57

On to step 2:
When dividing 72 by 57, we get 1 with a remainder of 15.
The next digit of our result is 1. 
Result so far: 1.0
If we take 57 away from 72, we end up with 15.
Bring next digit (7) of the dividend behind the 15 and repeat the process: 157 / 57

Advancing to step 3:
The number 57 fits into 157 2 times, leaving a remainder of 43.
The next digit of our result is 2. 
Result so far: 12.0
Subtracting 114 from 157 leaves us with 43.
Append the next digit (2) from the dividend to 43 and continue with: 432 / 57

Let's proceed to step 4:
If we divide 432 by 57, we get 7 and a remainder of 33.
Use 7 as the next digit of our solution. 
Result so far: 127.0
If we subtract 399 from 432, we get 33.
Include the next digit (9) from the dividend after 33, then repeat: 339 / 57

Step 5:
The number 57 fits into 339 5 times, leaving a remainder of 54.
Record the quotient 5 as the next digit in the result. 
Result so far: 1275.0
Deduct 285 from 339 and we're left with 54.
Take the next digit (1) from the dividend and append it to 54, then repeat: 541 / 57

Advancing to step 6:
If we divide 541 by 57, we get 9 and a remainder of 28.
Write down 9 as next digit of the result. 
Result so far: 12759.0
If we subtract 513 from 541, we get 28.
Since there are no more digits in the dividend, we add a zero to the remainder making it 280, and continue the process.

Let's proceed to step 7:
57 goes into 280 4 times with a remainder of 52.
The number 4 becomes the next digit in our result. 
Result so far: 12759.4
Deduct 228 from 280 and we're left with 52.
Since there are no more digits in the dividend, we add a zero to the remainder making it 520, and continue the process.

On to step 8:
57 goes into 520 9 times with a remainder of 7.
Put 9 as the next digit of the answer. 
Result so far: 12759.49
Deduct 513 from 520 and we're left with 7.
Since there are no more digits in the dividend, we add a zero to the remainder making it 70, and continue the process.

Let's proceed to step 9:
70 divided by 57 is 1 with a remainder of 13.
Put 1 as the next digit of the answer. 
Result so far: 12759.491
Subtracting 57 from 70 leaves us with 13.
Since there are no more digits in the dividend, we add a zero to the remainder making it 130, and continue the process.

Let's proceed to step 10:
57 goes into 130 2 times with a remainder of 16.
The next digit of our result is 2. 
Result so far: 12759.4912
If we subtract 114 from 130, we get 16.
Since there are no more digits in the dividend, we add a zero to the remainder making it 160, and continue the process.

Let's proceed to step 11:
If we divide 160 by 57, we get 2 and a remainder of 46.
Record the quotient 2 as the next digit in the result. 
Result so far: 12759.49122
If we take 114 away from 160, we end up 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.

The final outcome is 12759.49122, with a leftover of 4.6e-05.