We look at the division of 723561 by 78 
The aim is to understand the frequency of 78 in 723561.

Going ahead to step 1:
78 goes into 7 0 times with a remainder of 7.
Use 0 as the next digit of our solution. 
Result so far: 0.0
The remainder is 7 after subtracting 0 from 7.
Fetch the next digit (2) from the dividend, attach it to 7 and continue: 72 / 78

Moving on to step 2:
78 goes into 72 0 times with a remainder of 72.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we subtract 0 from 72, we get 72.
Include the next digit (3) from the dividend after 72, then repeat: 723 / 78

Moving on to step 3:
If we divide 723 by 78, we get 9 and a remainder of 21.
Put 9 as the next digit of the answer. 
Result so far: 9.0
Deduct 702 from 723 and we're left with 21.
Fetch the next digit (5) from the dividend, attach it to 21 and continue: 215 / 78

Advancing to step 4:
When dividing 215 by 78, we get 2 with a remainder of 59.
Use 2 as the next digit of our solution. 
Result so far: 92.0
Subtracting 156 from 215 leaves us with 59.
Bring next digit (6) of the dividend behind the 59 and repeat the process: 596 / 78

Advancing to step 5:
78 can be fit into 596 7 times, resulting in a remainder of 50.
Record the quotient 7 as the next digit in the result. 
Result so far: 927.0
Subtract 546 from 596 to get 50.
Append the next digit (1) from the dividend to 50 and continue with: 501 / 78

Step 6:
The number 78 fits into 501 6 times, leaving a remainder of 33.
Use 6 as the next digit of our solution. 
Result so far: 9276.0
If we subtract 468 from 501, we get 33.
Since there are no more digits in the dividend, we add a zero to the remainder making it 330, and continue the process.

Let's proceed to step 7:
330 divided by 78 is 4 with a remainder of 18.
Write down 4 as next digit of the result. 
Result so far: 9276.4
Subtract 312 from 330 to get 18.
Since there are no more digits in the dividend, we add a zero to the remainder making it 180, and continue the process.

On to step 8:
78 goes into 180 2 times with a remainder of 24.
Put 2 as the next digit of the answer. 
Result so far: 9276.42
If we take 156 away from 180, we end up with 24.
Since there are no more digits in the dividend, we add a zero to the remainder making it 240, and continue the process.

Moving on to step 9:
78 goes into 240 3 times with a remainder of 6.
The next digit of our result is 3. 
Result so far: 9276.423
If we take 234 away from 240, we end up with 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Moving on to step 10:
60 divided by 78 is 0 with a remainder of 60.
Put 0 as the next digit of the answer. 
Result so far: 9276.423
Subtracting 0 from 60 leaves us with 60.
Since there are no more digits in the dividend, we add a zero to the remainder making it 600, and continue the process.

Moving on to step 11:
When dividing 600 by 78, we get 7 with a remainder of 54.
Record the quotient 7 as the next digit in the result. 
Result so far: 9276.42307
Deduct 546 from 600 and we're left with 54.
Since there are no more digits in the dividend, we add a zero to the remainder making it 540, and continue the process.

Moving on to step 12:
78 can be fit into 540 6 times, resulting in a remainder of 72.
Record the quotient 6 as the next digit in the result. 
Result so far: 9276.423076
Subtract 468 from 540 to get 72.
Since there are no more digits in the dividend, we add a zero to the remainder making it 720, and continue the process.

Step 13:
78 goes into 720 9 times with a remainder of 18.
Write down 9 as next digit of the result. 
Result so far: 9276.4230769
Deduct 702 from 720 and we're left with 18.
Since there are no more digits in the dividend, we add a zero to the remainder making it 180, and continue the process.

Let's proceed to step 14:
When dividing 180 by 78, we get 2 with a remainder of 24.
Write down 2 as next digit of the result. 
Result so far: 9276.42307692
Deduct 156 from 180 and we're left with 24.
Since there are no more digits in the dividend, we add a zero to the remainder making it 240, and continue the process.

After the division, we end up with 9276.42307692 and a remainder of 2.4e-08.