We look at the division of 172496 by 72 
The aim is to understand the frequency of 72 in 172496.

Going ahead to step 1:
1 divided by 72 is 0 with a remainder of 1.
The next digit of our result is 0. 
Result so far: 0.0
The remainder is 1 after subtracting 0 from 1.
Fetch the next digit (7) from the dividend, attach it to 1 and continue: 17 / 72

Moving on to step 2:
When dividing 17 by 72, we get 0 with a remainder of 17.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtract 0 from 17 to get 17.
Bring next digit (2) of the dividend behind the 17 and repeat the process: 172 / 72

Step 3:
The number 72 fits into 172 2 times, leaving a remainder of 28.
Record the quotient 2 as the next digit in the result. 
Result so far: 2.0
The remainder is 28 after subtracting 144 from 172.
Include the next digit (4) from the dividend after 28, then repeat: 284 / 72

Advancing to step 4:
72 can be fit into 284 3 times, resulting in a remainder of 68.
Put 3 as the next digit of the answer. 
Result so far: 23.0
Subtracting 216 from 284 leaves us with 68.
Append the next digit (9) from the dividend to 68 and continue with: 689 / 72

Going ahead to step 5:
72 goes into 689 9 times with a remainder of 41.
The number 9 becomes the next digit in our result. 
Result so far: 239.0
The remainder is 41 after subtracting 648 from 689.
Fetch the next digit (6) from the dividend, attach it to 41 and continue: 416 / 72

Advancing to step 6:
If we divide 416 by 72, we get 5 and a remainder of 56.
Put 5 as the next digit of the answer. 
Result so far: 2395.0
The remainder is 56 after subtracting 360 from 416.
Since there are no more digits in the dividend, we add a zero to the remainder making it 560, and continue the process.

Moving on to step 7:
72 goes into 560 7 times with a remainder of 56.
Put 7 as the next digit of the answer. 
Result so far: 2395.7
The remainder is 56 after subtracting 504 from 560.
Since there are no more digits in the dividend, we add a zero to the remainder making it 560, and continue the process.

Moving on to step 8:
The number 72 fits into 560 7 times, leaving a remainder of 56.
Write down 7 as next digit of the result. 
Result so far: 2395.77
Deduct 504 from 560 and we're left with 56.
Since there are no more digits in the dividend, we add a zero to the remainder making it 560, and continue the process.

The final outcome is 2395.77, with a leftover of 0.056.