We look at the division of 778728 by 72 
The aim is to understand the frequency of 72 in 778728.

On to step 1:
72 goes into 7 0 times with a remainder of 7.
Write down 0 as next digit of the result. 
Result so far: 0.0
Deduct 0 from 7 and we're left with 7.
Include the next digit (7) from the dividend after 7, then repeat: 77 / 72

On to step 2:
72 goes into 77 1 times with a remainder of 5.
The number 1 becomes the next digit in our result. 
Result so far: 1.0
If we take 72 away from 77, we end up with 5.
Append the next digit (8) from the dividend to 5 and continue with: 58 / 72

Moving on to step 3:
72 goes into 58 0 times with a remainder of 58.
Record the quotient 0 as the next digit in the result. 
Result so far: 10.0
The remainder is 58 after subtracting 0 from 58.
Include the next digit (7) from the dividend after 58, then repeat: 587 / 72

Advancing to step 4:
72 goes into 587 8 times with a remainder of 11.
Write down 8 as next digit of the result. 
Result so far: 108.0
Deduct 576 from 587 and we're left with 11.
Take the next digit (2) from the dividend and append it to 11, then repeat: 112 / 72

Moving on to step 5:
If we divide 112 by 72, we get 1 and a remainder of 40.
The number 1 becomes the next digit in our result. 
Result so far: 1081.0
The remainder is 40 after subtracting 72 from 112.
Append the next digit (8) from the dividend to 40 and continue with: 408 / 72

Step 6:
72 can be fit into 408 5 times, resulting in a remainder of 48.
Use 5 as the next digit of our solution. 
Result so far: 10815.0
The remainder is 48 after subtracting 360 from 408.
Since there are no more digits in the dividend, we add a zero to the remainder making it 480, and continue the process.

On to step 7:
When dividing 480 by 72, we get 6 with a remainder of 48.
Write down 6 as next digit of the result. 
Result so far: 10815.6
Subtract 432 from 480 to get 48.
Since there are no more digits in the dividend, we add a zero to the remainder making it 480, and continue the process.

On to step 8:
When dividing 480 by 72, we get 6 with a remainder of 48.
Use 6 as the next digit of our solution. 
Result so far: 10815.66
The remainder is 48 after subtracting 432 from 480.
Since there are no more digits in the dividend, we add a zero to the remainder making it 480, and continue the process.

After the division, we end up with 10815.66 and a remainder of 0.048.