We're dividing 172550 by 78 
The aim is to understand the frequency of 78 in 172550.

Step 1:
When dividing 1 by 78, we get 0 with a remainder of 1.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtracting 0 from 1 leaves us with 1.
Include the next digit (7) from the dividend after 1, then repeat: 17 / 78

Advancing to step 2:
The number 78 fits into 17 0 times, leaving a remainder of 17.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Deduct 0 from 17 and we're left with 17.
Append the next digit (2) from the dividend to 17 and continue with: 172 / 78

Let's proceed to step 3:
78 can be fit into 172 2 times, resulting in a remainder of 16.
The next digit of our result is 2. 
Result so far: 2.0
If we take 156 away from 172, we end up with 16.
Fetch the next digit (5) from the dividend, attach it to 16 and continue: 165 / 78

On to step 4:
If we divide 165 by 78, we get 2 and a remainder of 9.
The number 2 becomes the next digit in our result. 
Result so far: 22.0
The remainder is 9 after subtracting 156 from 165.
Bring next digit (5) of the dividend behind the 9 and repeat the process: 95 / 78

Going ahead to step 5:
The number 78 fits into 95 1 times, leaving a remainder of 17.
Put 1 as the next digit of the answer. 
Result so far: 221.0
If we take 78 away from 95, we end up with 17.
Fetch the next digit (0) from the dividend, attach it to 17 and continue: 170 / 78

Moving on to step 6:
78 can be fit into 170 2 times, resulting in a remainder of 14.
Use 2 as the next digit of our solution. 
Result so far: 2212.0
If we take 156 away from 170, we end up with 14.
Since there are no more digits in the dividend, we add a zero to the remainder making it 140, and continue the process.

Going ahead to step 7:
When dividing 140 by 78, we get 1 with a remainder of 62.
Write down 1 as next digit of the result. 
Result so far: 2212.1
If we subtract 78 from 140, we get 62.
Since there are no more digits in the dividend, we add a zero to the remainder making it 620, and continue the process.

Step 8:
When dividing 620 by 78, we get 7 with a remainder of 74.
The next digit of our result is 7. 
Result so far: 2212.17
Deduct 546 from 620 and we're left with 74.
Since there are no more digits in the dividend, we add a zero to the remainder making it 740, and continue the process.

Moving on to step 9:
The number 78 fits into 740 9 times, leaving a remainder of 38.
Use 9 as the next digit of our solution. 
Result so far: 2212.179
The remainder is 38 after subtracting 702 from 740.
Since there are no more digits in the dividend, we add a zero to the remainder making it 380, and continue the process.

Advancing to step 10:
If we divide 380 by 78, we get 4 and a remainder of 68.
Record the quotient 4 as the next digit in the result. 
Result so far: 2212.1794
Deduct 312 from 380 and we're left with 68.
Since there are no more digits in the dividend, we add a zero to the remainder making it 680, and continue the process.

Step 11:
If we divide 680 by 78, we get 8 and a remainder of 56.
Put 8 as the next digit of the answer. 
Result so far: 2212.17948
Subtracting 624 from 680 leaves us with 56.
Since there are no more digits in the dividend, we add a zero to the remainder making it 560, and continue the process.

Let's proceed to step 12:
560 divided by 78 is 7 with a remainder of 14.
Write down 7 as next digit of the result. 
Result so far: 2212.179487
If we take 546 away from 560, we end up with 14.
Since there are no more digits in the dividend, we add a zero to the remainder making it 140, and continue the process.

Going ahead to step 13:
140 divided by 78 is 1 with a remainder of 62.
Put 1 as the next digit of the answer. 
Result so far: 2212.1794871
The remainder is 62 after subtracting 78 from 140.
Since there are no more digits in the dividend, we add a zero to the remainder making it 620, and continue the process.

On to step 14:
620 divided by 78 is 7 with a remainder of 74.
Record the quotient 7 as the next digit in the result. 
Result so far: 2212.17948717
If we subtract 546 from 620, we get 74.
Since there are no more digits in the dividend, we add a zero to the remainder making it 740, and continue the process.

Our division results in 2212.17948717 with a remaining 7.4e-08.