We look at the division of 42078124 by 172 
The aim is to understand the frequency of 172 in 42078124.

On to step 1:
172 can be fit into 4 0 times, resulting in a remainder of 4.
Write down 0 as next digit of the result. 
Result so far: 0.0
Deduct 0 from 4 and we're left with 4.
Fetch the next digit (2) from the dividend, attach it to 4 and continue: 42 / 172

Let's proceed to step 2:
If we divide 42 by 172, we get 0 and a remainder of 42.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtract 0 from 42 to get 42.
Fetch the next digit (0) from the dividend, attach it to 42 and continue: 420 / 172

Moving on to step 3:
If we divide 420 by 172, we get 2 and a remainder of 76.
Use 2 as the next digit of our solution. 
Result so far: 2.0
Deduct 344 from 420 and we're left with 76.
Include the next digit (7) from the dividend after 76, then repeat: 767 / 172

Step 4:
If we divide 767 by 172, we get 4 and a remainder of 79.
The next digit of our result is 4. 
Result so far: 24.0
Subtract 688 from 767 to get 79.
Bring next digit (8) of the dividend behind the 79 and repeat the process: 798 / 172

Step 5:
172 can be fit into 798 4 times, resulting in a remainder of 110.
Record the quotient 4 as the next digit in the result. 
Result so far: 244.0
If we subtract 688 from 798, we get 110.
Fetch the next digit (1) from the dividend, attach it to 110 and continue: 1101 / 172

Moving on to step 6:
The number 172 fits into 1101 6 times, leaving a remainder of 69.
Record the quotient 6 as the next digit in the result. 
Result so far: 2446.0
If we take 1032 away from 1101, we end up with 69.
Grab the next digit (2) from the dividend, add it to 69, then carry on: 692 / 172

Advancing to step 7:
When dividing 692 by 172, we get 4 with a remainder of 4.
The next digit of our result is 4. 
Result so far: 24464.0
Subtracting 688 from 692 leaves us with 4.
Fetch the next digit (4) from the dividend, attach it to 4 and continue: 44 / 172

Let's proceed to step 8:
172 can be fit into 44 0 times, resulting in a remainder of 44.
Record the quotient 0 as the next digit in the result. 
Result so far: 244640.0
If we take 0 away from 44, we end up with 44.
Since there are no more digits in the dividend, we add a zero to the remainder making it 440, and continue the process.

On to step 9:
440 divided by 172 is 2 with a remainder of 96.
Record the quotient 2 as the next digit in the result. 
Result so far: 244640.2
If we take 344 away from 440, we end up with 96.
Since there are no more digits in the dividend, we add a zero to the remainder making it 960, and continue the process.

Let's proceed to step 10:
960 divided by 172 is 5 with a remainder of 100.
The next digit of our result is 5. 
Result so far: 244640.25
If we subtract 860 from 960, we get 100.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1000, and continue the process.

Let's proceed to step 11:
172 goes into 1000 5 times with a remainder of 140.
Use 5 as the next digit of our solution. 
Result so far: 244640.255
Deduct 860 from 1000 and we're left with 140.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1400, and continue the process.

After the division, we end up with 244640.255 and a remainder of 0.014.