We're dividing 8466451 by 172 
We want to figure out the number of times 8466451 can be divided by 172.

Let's proceed to step 1:
8 divided by 172 is 0 with a remainder of 8.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Deduct 0 from 8 and we're left with 8.
Include the next digit (4) from the dividend after 8, then repeat: 84 / 172

Step 2:
84 divided by 172 is 0 with a remainder of 84.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
The remainder is 84 after subtracting 0 from 84.
Bring next digit (6) of the dividend behind the 84 and repeat the process: 846 / 172

Going ahead to step 3:
When dividing 846 by 172, we get 4 with a remainder of 158.
Put 4 as the next digit of the answer. 
Result so far: 4.0
If we take 688 away from 846, we end up with 158.
Bring next digit (6) of the dividend behind the 158 and repeat the process: 1586 / 172

Advancing to step 4:
If we divide 1586 by 172, we get 9 and a remainder of 38.
Record the quotient 9 as the next digit in the result. 
Result so far: 49.0
Subtracting 1548 from 1586 leaves us with 38.
Take the next digit (4) from the dividend and append it to 38, then repeat: 384 / 172

Let's proceed to step 5:
When dividing 384 by 172, we get 2 with a remainder of 40.
The next digit of our result is 2. 
Result so far: 492.0
The remainder is 40 after subtracting 344 from 384.
Grab the next digit (5) from the dividend, add it to 40, then carry on: 405 / 172

Step 6:
172 goes into 405 2 times with a remainder of 61.
The number 2 becomes the next digit in our result. 
Result so far: 4922.0
If we subtract 344 from 405, we get 61.
Bring next digit (1) of the dividend behind the 61 and repeat the process: 611 / 172

Step 7:
When dividing 611 by 172, we get 3 with a remainder of 95.
Put 3 as the next digit of the answer. 
Result so far: 49223.0
Subtract 516 from 611 to get 95.
Since there are no more digits in the dividend, we add a zero to the remainder making it 950, and continue the process.

On to step 8:
The number 172 fits into 950 5 times, leaving a remainder of 90.
The next digit of our result is 5. 
Result so far: 49223.5
Subtracting 860 from 950 leaves us with 90.
Since there are no more digits in the dividend, we add a zero to the remainder making it 900, and continue the process.

Step 9:
When dividing 900 by 172, we get 5 with a remainder of 40.
Write down 5 as next digit of the result. 
Result so far: 49223.55
If we subtract 860 from 900, we 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.

After the division, we end up with 49223.55 and a remainder of 0.04.