We're dividing 66229146 by 172 
We want to figure out the number of times 66229146 can be divided by 172.

Going ahead to step 1:
The number 172 fits into 6 0 times, leaving a remainder of 6.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtract 0 from 6 to get 6.
Append the next digit (6) from the dividend to 6 and continue with: 66 / 172

Step 2:
172 can be fit into 66 0 times, resulting in a remainder of 66.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtracting 0 from 66 leaves us with 66.
Append the next digit (2) from the dividend to 66 and continue with: 662 / 172

Moving on to step 3:
If we divide 662 by 172, we get 3 and a remainder of 146.
Write down 3 as next digit of the result. 
Result so far: 3.0
Deduct 516 from 662 and we're left with 146.
Include the next digit (2) from the dividend after 146, then repeat: 1462 / 172

On to step 4:
1462 divided by 172 is 8 with a remainder of 86.
Put 8 as the next digit of the answer. 
Result so far: 38.0
If we subtract 1376 from 1462, we get 86.
Take the next digit (9) from the dividend and append it to 86, then repeat: 869 / 172

Moving on to step 5:
172 can be fit into 869 5 times, resulting in a remainder of 9.
Put 5 as the next digit of the answer. 
Result so far: 385.0
Deduct 860 from 869 and we're left with 9.
Take the next digit (1) from the dividend and append it to 9, then repeat: 91 / 172

Step 6:
172 goes into 91 0 times with a remainder of 91.
The number 0 becomes the next digit in our result. 
Result so far: 3850.0
If we subtract 0 from 91, we get 91.
Include the next digit (4) from the dividend after 91, then repeat: 914 / 172

Going ahead to step 7:
When dividing 914 by 172, we get 5 with a remainder of 54.
The number 5 becomes the next digit in our result. 
Result so far: 38505.0
Subtracting 860 from 914 leaves us with 54.
Fetch the next digit (6) from the dividend, attach it to 54 and continue: 546 / 172

Advancing to step 8:
546 divided by 172 is 3 with a remainder of 30.
The number 3 becomes the next digit in our result. 
Result so far: 385053.0
Subtracting 516 from 546 leaves us with 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

Advancing to step 9:
If we divide 300 by 172, we get 1 and a remainder of 128.
Record the quotient 1 as the next digit in the result. 
Result so far: 385053.1
If we take 172 away from 300, we end up with 128.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1280, and continue the process.

Moving on to step 10:
When dividing 1280 by 172, we get 7 with a remainder of 76.
The number 7 becomes the next digit in our result. 
Result so far: 385053.17
Subtracting 1204 from 1280 leaves us with 76.
Since there are no more digits in the dividend, we add a zero to the remainder making it 760, and continue the process.

On to step 11:
If we divide 760 by 172, we get 4 and a remainder of 72.
Use 4 as the next digit of our solution. 
Result so far: 385053.174
Deduct 688 from 760 and we're left with 72.
Since there are no more digits in the dividend, we add a zero to the remainder making it 720, and continue the process.

Going ahead to step 12:
When dividing 720 by 172, we get 4 with a remainder of 32.
Put 4 as the next digit of the answer. 
Result so far: 385053.1744
If we subtract 688 from 720, we get 32.
Since there are no more digits in the dividend, we add a zero to the remainder making it 320, and continue the process.

The final result is 385053.1744 with a remainder of 0.00032.