We look at the division of 784621 by 72 
The aim is to understand the frequency of 72 in 784621.

Advancing to step 1:
The number 72 fits into 7 0 times, leaving a remainder of 7.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtract 0 from 7 to get 7.
Fetch the next digit (8) from the dividend, attach it to 7 and continue: 78 / 72

On to step 2:
If we divide 78 by 72, we get 1 and a remainder of 6.
The next digit of our result is 1. 
Result so far: 1.0
If we subtract 72 from 78, we get 6.
Grab the next digit (4) from the dividend, add it to 6, then carry on: 64 / 72

Advancing to step 3:
The number 72 fits into 64 0 times, leaving a remainder of 64.
The next digit of our result is 0. 
Result so far: 10.0
Deduct 0 from 64 and we're left with 64.
Take the next digit (6) from the dividend and append it to 64, then repeat: 646 / 72

Moving on to step 4:
646 divided by 72 is 8 with a remainder of 70.
Use 8 as the next digit of our solution. 
Result so far: 108.0
Subtracting 576 from 646 leaves us with 70.
Grab the next digit (2) from the dividend, add it to 70, then carry on: 702 / 72

On to step 5:
72 goes into 702 9 times with a remainder of 54.
Record the quotient 9 as the next digit in the result. 
Result so far: 1089.0
Subtract 648 from 702 to get 54.
Grab the next digit (1) from the dividend, add it to 54, then carry on: 541 / 72

Step 6:
72 can be fit into 541 7 times, resulting in a remainder of 37.
The number 7 becomes the next digit in our result. 
Result so far: 10897.0
If we take 504 away from 541, we end up with 37.
Since there are no more digits in the dividend, we add a zero to the remainder making it 370, and continue the process.

Step 7:
When dividing 370 by 72, we get 5 with a remainder of 10.
Put 5 as the next digit of the answer. 
Result so far: 10897.5
Deduct 360 from 370 and we're left with 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Going ahead to step 8:
72 goes into 100 1 times with a remainder of 28.
The next digit of our result is 1. 
Result so far: 10897.51
Subtract 72 from 100 to 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.

Going ahead to step 9:
72 can be fit into 280 3 times, resulting in a remainder of 64.
Write down 3 as next digit of the result. 
Result so far: 10897.513
If we subtract 216 from 280, we get 64.
Since there are no more digits in the dividend, we add a zero to the remainder making it 640, and continue the process.

On to step 10:
72 can be fit into 640 8 times, resulting in a remainder of 64.
Use 8 as the next digit of our solution. 
Result so far: 10897.5138
Subtracting 576 from 640 leaves us with 64.
Since there are no more digits in the dividend, we add a zero to the remainder making it 640, and continue the process.

Let's proceed to step 11:
When dividing 640 by 72, we get 8 with a remainder of 64.
Put 8 as the next digit of the answer. 
Result so far: 10897.51388
Subtracting 576 from 640 leaves us with 64.
Since there are no more digits in the dividend, we add a zero to the remainder making it 640, and continue the process.

The final result is 10897.51388 with a remainder of 6.4e-05.