86428412 ÷ 765 
The aim is to understand the frequency of 765 in 86428412.

Advancing to step 1:
When dividing 8 by 765, we get 0 with a remainder of 8.
The next digit of our result is 0. 
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 / 765

Moving on to step 2:
765 goes into 86 0 times with a remainder of 86.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we subtract 0 from 86, we get 86.
Append the next digit (4) from the dividend to 86 and continue with: 864 / 765

Step 3:
765 can be fit into 864 1 times, resulting in a remainder of 99.
Write down 1 as next digit of the result. 
Result so far: 1.0
If we take 765 away from 864, we end up with 99.
Take the next digit (2) from the dividend and append it to 99, then repeat: 992 / 765

Advancing to step 4:
The number 765 fits into 992 1 times, leaving a remainder of 227.
Put 1 as the next digit of the answer. 
Result so far: 11.0
If we subtract 765 from 992, we get 227.
Bring next digit (8) of the dividend behind the 227 and repeat the process: 2278 / 765

Let's proceed to step 5:
If we divide 2278 by 765, we get 2 and a remainder of 748.
The number 2 becomes the next digit in our result. 
Result so far: 112.0
Subtract 1530 from 2278 to get 748.
Take the next digit (4) from the dividend and append it to 748, then repeat: 7484 / 765

Step 6:
The number 765 fits into 7484 9 times, leaving a remainder of 599.
Record the quotient 9 as the next digit in the result. 
Result so far: 1129.0
Subtracting 6885 from 7484 leaves us with 599.
Grab the next digit (1) from the dividend, add it to 599, then carry on: 5991 / 765

Advancing to step 7:
The number 765 fits into 5991 7 times, leaving a remainder of 636.
Use 7 as the next digit of our solution. 
Result so far: 11297.0
If we subtract 5355 from 5991, we get 636.
Take the next digit (2) from the dividend and append it to 636, then repeat: 6362 / 765

Step 8:
The number 765 fits into 6362 8 times, leaving a remainder of 242.
The number 8 becomes the next digit in our result. 
Result so far: 112978.0
Subtracting 6120 from 6362 leaves us with 242.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2420, and continue the process.

On to step 9:
765 goes into 2420 3 times with a remainder of 125.
Record the quotient 3 as the next digit in the result. 
Result so far: 112978.3
If we take 2295 away from 2420, we end up with 125.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1250, and continue the process.

Step 10:
The number 765 fits into 1250 1 times, leaving a remainder of 485.
The next digit of our result is 1. 
Result so far: 112978.31
Deduct 765 from 1250 and we're left with 485.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4850, and continue the process.

Moving on to step 11:
4850 divided by 765 is 6 with a remainder of 260.
Put 6 as the next digit of the answer. 
Result so far: 112978.316
If we subtract 4590 from 4850, we get 260.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2600, and continue the process.

Let's proceed to step 12:
When dividing 2600 by 765, we get 3 with a remainder of 305.
Put 3 as the next digit of the answer. 
Result so far: 112978.3163
The remainder is 305 after subtracting 2295 from 2600.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3050, and continue the process.

Moving on to step 13:
765 can be fit into 3050 3 times, resulting in a remainder of 755.
The next digit of our result is 3. 
Result so far: 112978.31633
Deduct 2295 from 3050 and we're left with 755.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7550, and continue the process.

After the division, we end up with 112978.31633 and a remainder of 0.000755.