We look at the division of 409376 by 72 
The aim is to understand the frequency of 72 in 409376.

Going ahead to step 1:
The number 72 fits into 4 0 times, leaving a remainder of 4.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtract 0 from 4 to get 4.
Include the next digit (0) from the dividend after 4, then repeat: 40 / 72

Going ahead to step 2:
72 can be fit into 40 0 times, resulting in a remainder of 40.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we subtract 0 from 40, we get 40.
Fetch the next digit (9) from the dividend, attach it to 40 and continue: 409 / 72

Going ahead to step 3:
When dividing 409 by 72, we get 5 with a remainder of 49.
Record the quotient 5 as the next digit in the result. 
Result so far: 5.0
If we subtract 360 from 409, we get 49.
Take the next digit (3) from the dividend and append it to 49, then repeat: 493 / 72

On to step 4:
The number 72 fits into 493 6 times, leaving a remainder of 61.
Use 6 as the next digit of our solution. 
Result so far: 56.0
Deduct 432 from 493 and we're left with 61.
Fetch the next digit (7) from the dividend, attach it to 61 and continue: 617 / 72

Advancing to step 5:
The number 72 fits into 617 8 times, leaving a remainder of 41.
The next digit of our result is 8. 
Result so far: 568.0
Deduct 576 from 617 and we're left with 41.
Append the next digit (6) from the dividend to 41 and continue with: 416 / 72

Moving on to step 6:
The number 72 fits into 416 5 times, leaving a remainder of 56.
Record the quotient 5 as the next digit in the result. 
Result so far: 5685.0
Subtract 360 from 416 to get 56.
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 can be fit into 560 7 times, resulting in a remainder of 56.
Put 7 as the next digit of the answer. 
Result so far: 5685.7
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.

Step 8:
If we divide 560 by 72, we get 7 and a remainder of 56.
The number 7 becomes the next digit in our result. 
Result so far: 5685.77
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.

The final outcome is 5685.77, with a leftover of 0.056.