We look at the division of 66131142 by 478 
The aim is to understand the frequency of 478 in 66131142.

Moving on to step 1:
The number 478 fits into 6 0 times, leaving a remainder of 6.
The next digit of our result is 0. 
Result so far: 0.0
If we subtract 0 from 6, we get 6.
Append the next digit (6) from the dividend to 6 and continue with: 66 / 478

Advancing to step 2:
If we divide 66 by 478, we get 0 and a remainder of 66.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we subtract 0 from 66, we get 66.
Bring next digit (1) of the dividend behind the 66 and repeat the process: 661 / 478

Let's proceed to step 3:
The number 478 fits into 661 1 times, leaving a remainder of 183.
Record the quotient 1 as the next digit in the result. 
Result so far: 1.0
Subtracting 478 from 661 leaves us with 183.
Grab the next digit (3) from the dividend, add it to 183, then carry on: 1833 / 478

On to step 4:
478 can be fit into 1833 3 times, resulting in a remainder of 399.
Use 3 as the next digit of our solution. 
Result so far: 13.0
Deduct 1434 from 1833 and we're left with 399.
Include the next digit (1) from the dividend after 399, then repeat: 3991 / 478

Advancing to step 5:
The number 478 fits into 3991 8 times, leaving a remainder of 167.
Write down 8 as next digit of the result. 
Result so far: 138.0
If we take 3824 away from 3991, we end up with 167.
Grab the next digit (1) from the dividend, add it to 167, then carry on: 1671 / 478

Going ahead to step 6:
When dividing 1671 by 478, we get 3 with a remainder of 237.
Put 3 as the next digit of the answer. 
Result so far: 1383.0
Deduct 1434 from 1671 and we're left with 237.
Fetch the next digit (4) from the dividend, attach it to 237 and continue: 2374 / 478

Going ahead to step 7:
478 goes into 2374 4 times with a remainder of 462.
Put 4 as the next digit of the answer. 
Result so far: 13834.0
Subtracting 1912 from 2374 leaves us with 462.
Include the next digit (2) from the dividend after 462, then repeat: 4622 / 478

Let's proceed to step 8:
4622 divided by 478 is 9 with a remainder of 320.
Use 9 as the next digit of our solution. 
Result so far: 138349.0
Subtracting 4302 from 4622 leaves us with 320.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3200, and continue the process.

Advancing to step 9:
478 goes into 3200 6 times with a remainder of 332.
Record the quotient 6 as the next digit in the result. 
Result so far: 138349.6
If we subtract 2868 from 3200, we get 332.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3320, and continue the process.

On to step 10:
The number 478 fits into 3320 6 times, leaving a remainder of 452.
The number 6 becomes the next digit in our result. 
Result so far: 138349.66
If we take 2868 away from 3320, we end up with 452.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4520, and continue the process.

Our division results in 138349.66 with a remaining 0.452.