We look at the division of 878492 by 72 
The aim is to understand the frequency of 72 in 878492.

Step 1:
8 divided by 72 is 0 with a remainder of 8.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Deduct 0 from 8 and we're left with 8.
Grab the next digit (7) from the dividend, add it to 8, then carry on: 87 / 72

Advancing to step 2:
The number 72 fits into 87 1 times, leaving a remainder of 15.
Use 1 as the next digit of our solution. 
Result so far: 1.0
Deduct 72 from 87 and we're left with 15.
Bring next digit (8) of the dividend behind the 15 and repeat the process: 158 / 72

Moving on to step 3:
158 divided by 72 is 2 with a remainder of 14.
Put 2 as the next digit of the answer. 
Result so far: 12.0
Subtract 144 from 158 to get 14.
Take the next digit (4) from the dividend and append it to 14, then repeat: 144 / 72

Moving on to step 4:
If we divide 144 by 72, we get 2 and a remainder of 0.
Record the quotient 2 as the next digit in the result. 
Result so far: 122.0
If we take 144 away from 144, we end up with 0.
Include the next digit (9) from the dividend after 0, then repeat: 9 / 72

Moving on to step 5:
The number 72 fits into 9 0 times, leaving a remainder of 9.
The next digit of our result is 0. 
Result so far: 1220.0
The remainder is 9 after subtracting 0 from 9.
Grab the next digit (2) from the dividend, add it to 9, then carry on: 92 / 72

On to step 6:
The number 72 fits into 92 1 times, leaving a remainder of 20.
Record the quotient 1 as the next digit in the result. 
Result so far: 12201.0
Subtract 72 from 92 to get 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Moving on to step 7:
If we divide 200 by 72, we get 2 and a remainder of 56.
The number 2 becomes the next digit in our result. 
Result so far: 12201.2
Subtracting 144 from 200 leaves us 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.

Advancing to step 8:
72 can be fit into 560 7 times, resulting in a remainder of 56.
Write down 7 as next digit of the result. 
Result so far: 12201.27
If we take 504 away from 560, we end up 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.

Step 9:
72 goes into 560 7 times with a remainder of 56.
Record the quotient 7 as the next digit in the result. 
Result so far: 12201.277
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 12201.277, with a leftover of 0.0056.