We look at the division of 869593 by 78 
The aim is to understand the frequency of 78 in 869593.

Step 1:
78 goes into 8 0 times 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.
Take the next digit (6) from the dividend and append it to 8, then repeat: 86 / 78

Advancing to step 2:
The number 78 fits into 86 1 times, leaving a remainder of 8.
Record the quotient 1 as the next digit in the result. 
Result so far: 1.0
If we take 78 away from 86, we end up with 8.
Append the next digit (9) from the dividend to 8 and continue with: 89 / 78

Moving on to step 3:
78 can be fit into 89 1 times, resulting in a remainder of 11.
Put 1 as the next digit of the answer. 
Result so far: 11.0
Subtracting 78 from 89 leaves us with 11.
Fetch the next digit (5) from the dividend, attach it to 11 and continue: 115 / 78

Moving on to step 4:
When dividing 115 by 78, we get 1 with a remainder of 37.
Write down 1 as next digit of the result. 
Result so far: 111.0
Subtracting 78 from 115 leaves us with 37.
Bring next digit (9) of the dividend behind the 37 and repeat the process: 379 / 78

On to step 5:
379 divided by 78 is 4 with a remainder of 67.
The number 4 becomes the next digit in our result. 
Result so far: 1114.0
Deduct 312 from 379 and we're left with 67.
Append the next digit (3) from the dividend to 67 and continue with: 673 / 78

Step 6:
If we divide 673 by 78, we get 8 and a remainder of 49.
The number 8 becomes the next digit in our result. 
Result so far: 11148.0
The remainder is 49 after subtracting 624 from 673.
Since there are no more digits in the dividend, we add a zero to the remainder making it 490, and continue the process.

Moving on to step 7:
If we divide 490 by 78, we get 6 and a remainder of 22.
The number 6 becomes the next digit in our result. 
Result so far: 11148.6
Subtracting 468 from 490 leaves us with 22.
Since there are no more digits in the dividend, we add a zero to the remainder making it 220, and continue the process.

On to step 8:
78 goes into 220 2 times with a remainder of 64.
The next digit of our result is 2. 
Result so far: 11148.62
Subtracting 156 from 220 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.

On to step 9:
The number 78 fits into 640 8 times, leaving a remainder of 16.
The number 8 becomes the next digit in our result. 
Result so far: 11148.628
Subtract 624 from 640 to get 16.
Since there are no more digits in the dividend, we add a zero to the remainder making it 160, and continue the process.

Let's proceed to step 10:
78 goes into 160 2 times with a remainder of 4.
The next digit of our result is 2. 
Result so far: 11148.6282
The remainder is 4 after subtracting 156 from 160.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

On to step 11:
78 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: 11148.6282
If we subtract 0 from 40, we get 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

Step 12:
When dividing 400 by 78, we get 5 with a remainder of 10.
Put 5 as the next digit of the answer. 
Result so far: 11148.628205
Subtract 390 from 400 to get 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 13:
100 divided by 78 is 1 with a remainder of 22.
Record the quotient 1 as the next digit in the result. 
Result so far: 11148.6282051
If we take 78 away from 100, we end up with 22.
Since there are no more digits in the dividend, we add a zero to the remainder making it 220, and continue the process.

Going ahead to step 14:
When dividing 220 by 78, we get 2 with a remainder of 64.
Use 2 as the next digit of our solution. 
Result so far: 11148.62820512
If we take 156 away from 220, we end up 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 11148.62820512 with a remainder of 6.4e-08.