We look at the division of 66415188 by 171 
Let's see how many times 171 fits into 66415188.

Step 1:
When dividing 6 by 171, we get 0 with a remainder of 6.
Write down 0 as next digit of the result. 
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 / 171

On to step 2:
171 goes into 66 0 times with a remainder of 66.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtracting 0 from 66 leaves us with 66.
Grab the next digit (4) from the dividend, add it to 66, then carry on: 664 / 171

Going ahead to step 3:
664 divided by 171 is 3 with a remainder of 151.
The next digit of our result is 3. 
Result so far: 3.0
The remainder is 151 after subtracting 513 from 664.
Fetch the next digit (1) from the dividend, attach it to 151 and continue: 1511 / 171

Advancing to step 4:
171 goes into 1511 8 times with a remainder of 143.
Use 8 as the next digit of our solution. 
Result so far: 38.0
Subtract 1368 from 1511 to get 143.
Bring next digit (5) of the dividend behind the 143 and repeat the process: 1435 / 171

Going ahead to step 5:
The number 171 fits into 1435 8 times, leaving a remainder of 67.
The number 8 becomes the next digit in our result. 
Result so far: 388.0
The remainder is 67 after subtracting 1368 from 1435.
Append the next digit (1) from the dividend to 67 and continue with: 671 / 171

Step 6:
171 goes into 671 3 times with a remainder of 158.
The next digit of our result is 3. 
Result so far: 3883.0
Subtract 513 from 671 to get 158.
Bring next digit (8) of the dividend behind the 158 and repeat the process: 1588 / 171

Moving on to step 7:
If we divide 1588 by 171, we get 9 and a remainder of 49.
Write down 9 as next digit of the result. 
Result so far: 38839.0
Subtract 1539 from 1588 to get 49.
Include the next digit (8) from the dividend after 49, then repeat: 498 / 171

Going ahead to step 8:
The number 171 fits into 498 2 times, leaving a remainder of 156.
The next digit of our result is 2. 
Result so far: 388392.0
Deduct 342 from 498 and we're left with 156.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1560, and continue the process.

Advancing to step 9:
When dividing 1560 by 171, we get 9 with a remainder of 21.
Put 9 as the next digit of the answer. 
Result so far: 388392.9
Subtracting 1539 from 1560 leaves us with 21.
Since there are no more digits in the dividend, we add a zero to the remainder making it 210, and continue the process.

On to step 10:
If we divide 210 by 171, we get 1 and a remainder of 39.
Record the quotient 1 as the next digit in the result. 
Result so far: 388392.91
Deduct 171 from 210 and we're left with 39.
Since there are no more digits in the dividend, we add a zero to the remainder making it 390, and continue the process.

Moving on to step 11:
If we divide 390 by 171, we get 2 and a remainder of 48.
Record the quotient 2 as the next digit in the result. 
Result so far: 388392.912
Subtract 342 from 390 to get 48.
Since there are no more digits in the dividend, we add a zero to the remainder making it 480, and continue the process.

Step 12:
171 can be fit into 480 2 times, resulting in a remainder of 138.
The number 2 becomes the next digit in our result. 
Result so far: 388392.9122
If we take 342 away from 480, we end up with 138.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1380, and continue the process.

After the division, we end up with 388392.9122 and a remainder of 0.00138.