We look at the division of 78338107 by 455 
The aim is to understand the frequency of 455 in 78338107.

Going ahead to step 1:
455 can be fit into 7 0 times, resulting in a remainder of 7.
Write down 0 as next digit of the result. 
Result so far: 0.0
Deduct 0 from 7 and we're left with 7.
Append the next digit (8) from the dividend to 7 and continue with: 78 / 455

Let's proceed to step 2:
When dividing 78 by 455, we get 0 with a remainder of 78.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we take 0 away from 78, we end up with 78.
Fetch the next digit (3) from the dividend, attach it to 78 and continue: 783 / 455

Moving on to step 3:
If we divide 783 by 455, we get 1 and a remainder of 328.
Put 1 as the next digit of the answer. 
Result so far: 1.0
If we take 455 away from 783, we end up with 328.
Bring next digit (3) of the dividend behind the 328 and repeat the process: 3283 / 455

Advancing to step 4:
3283 divided by 455 is 7 with a remainder of 98.
The number 7 becomes the next digit in our result. 
Result so far: 17.0
If we subtract 3185 from 3283, we get 98.
Include the next digit (8) from the dividend after 98, then repeat: 988 / 455

Advancing to step 5:
455 goes into 988 2 times with a remainder of 78.
The next digit of our result is 2. 
Result so far: 172.0
The remainder is 78 after subtracting 910 from 988.
Include the next digit (1) from the dividend after 78, then repeat: 781 / 455

Moving on to step 6:
If we divide 781 by 455, we get 1 and a remainder of 326.
The number 1 becomes the next digit in our result. 
Result so far: 1721.0
Subtracting 455 from 781 leaves us with 326.
Grab the next digit (0) from the dividend, add it to 326, then carry on: 3260 / 455

Advancing to step 7:
455 goes into 3260 7 times with a remainder of 75.
Put 7 as the next digit of the answer. 
Result so far: 17217.0
Subtract 3185 from 3260 to get 75.
Fetch the next digit (7) from the dividend, attach it to 75 and continue: 757 / 455

Step 8:
The number 455 fits into 757 1 times, leaving a remainder of 302.
Record the quotient 1 as the next digit in the result. 
Result so far: 172171.0
The remainder is 302 after subtracting 455 from 757.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3020, and continue the process.

Moving on to step 9:
If we divide 3020 by 455, we get 6 and a remainder of 290.
Use 6 as the next digit of our solution. 
Result so far: 172171.6
The remainder is 290 after subtracting 2730 from 3020.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2900, and continue the process.

Moving on to step 10:
455 can be fit into 2900 6 times, resulting in a remainder of 170.
The number 6 becomes the next digit in our result. 
Result so far: 172171.66
Subtracting 2730 from 2900 leaves us with 170.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1700, and continue the process.

The final outcome is 172171.66, with a leftover of 0.17.