We look at the division of 66603103 by 172 
The aim is to understand the frequency of 172 in 66603103.

Let's proceed to step 1:
172 goes into 6 0 times with a remainder of 6.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
The remainder is 6 after subtracting 0 from 6.
Take the next digit (6) from the dividend and append it to 6, then repeat: 66 / 172

Moving on to step 2:
The number 172 fits into 66 0 times, leaving a remainder of 66.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Deduct 0 from 66 and we're left with 66.
Bring next digit (6) of the dividend behind the 66 and repeat the process: 666 / 172

Step 3:
172 goes into 666 3 times with a remainder of 150.
The next digit of our result is 3. 
Result so far: 3.0
Subtract 516 from 666 to get 150.
Take the next digit (0) from the dividend and append it to 150, then repeat: 1500 / 172

Let's proceed to step 4:
172 goes into 1500 8 times with a remainder of 124.
The next digit of our result is 8. 
Result so far: 38.0
Subtract 1376 from 1500 to get 124.
Grab the next digit (3) from the dividend, add it to 124, then carry on: 1243 / 172

Step 5:
If we divide 1243 by 172, we get 7 and a remainder of 39.
Write down 7 as next digit of the result. 
Result so far: 387.0
Subtracting 1204 from 1243 leaves us with 39.
Include the next digit (1) from the dividend after 39, then repeat: 391 / 172

On to step 6:
The number 172 fits into 391 2 times, leaving a remainder of 47.
Write down 2 as next digit of the result. 
Result so far: 3872.0
If we take 344 away from 391, we end up with 47.
Take the next digit (0) from the dividend and append it to 47, then repeat: 470 / 172

Moving on to step 7:
If we divide 470 by 172, we get 2 and a remainder of 126.
The next digit of our result is 2. 
Result so far: 38722.0
Subtracting 344 from 470 leaves us with 126.
Append the next digit (3) from the dividend to 126 and continue with: 1263 / 172

Moving on to step 8:
172 can be fit into 1263 7 times, resulting in a remainder of 59.
Use 7 as the next digit of our solution. 
Result so far: 387227.0
Subtract 1204 from 1263 to get 59.
Since there are no more digits in the dividend, we add a zero to the remainder making it 590, and continue the process.

Moving on to step 9:
590 divided by 172 is 3 with a remainder of 74.
The number 3 becomes the next digit in our result. 
Result so far: 387227.3
If we take 516 away from 590, we end up 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.

On to step 10:
740 divided by 172 is 4 with a remainder of 52.
Record the quotient 4 as the next digit in the result. 
Result so far: 387227.34
Subtracting 688 from 740 leaves us with 52.
Since there are no more digits in the dividend, we add a zero to the remainder making it 520, and continue the process.

Moving on to step 11:
If we divide 520 by 172, we get 3 and a remainder of 4.
Use 3 as the next digit of our solution. 
Result so far: 387227.343
If we take 516 away from 520, we end up with 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Moving on to step 12:
When dividing 40 by 172, we get 0 with a remainder of 40.
Put 0 as the next digit of the answer. 
Result so far: 387227.343
Subtract 0 from 40 to 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 13:
172 goes into 400 2 times with a remainder of 56.
Write down 2 as next digit of the result. 
Result so far: 387227.34302
Subtract 344 from 400 to get 56.
Since there are no more digits in the dividend, we add a zero to the remainder making it 560, and continue the process.

Going ahead to step 14:
When dividing 560 by 172, we get 3 with a remainder of 44.
The next digit of our result is 3. 
Result so far: 387227.343023
Subtract 516 from 560 to get 44.
Since there are no more digits in the dividend, we add a zero to the remainder making it 440, and continue the process.

Let's proceed to step 15:
172 goes into 440 2 times with a remainder of 96.
The next digit of our result is 2. 
Result so far: 387227.3430232
Subtracting 344 from 440 leaves us 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.

Advancing to step 16:
When dividing 960 by 172, we get 5 with a remainder of 100.
The next digit of our result is 5. 
Result so far: 387227.34302325
Subtracting 860 from 960 leaves us with 100.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1000, and continue the process.

Our division results in 387227.34302325 with a remaining 1e-07.