We look at the division of 21432423 by 172 
We want to divide 21432423 by 172.

Step 1:
If we divide 2 by 172, we get 0 and a remainder of 2.
The next digit of our result is 0. 
Result so far: 0.0
Subtracting 0 from 2 leaves us with 2.
Include the next digit (1) from the dividend after 2, then repeat: 21 / 172

Moving on to step 2:
The number 172 fits into 21 0 times, leaving a remainder of 21.
The next digit of our result is 0. 
Result so far: 0.0
Deduct 0 from 21 and we're left with 21.
Fetch the next digit (4) from the dividend, attach it to 21 and continue: 214 / 172

On to step 3:
172 can be fit into 214 1 times, resulting in a remainder of 42.
Write down 1 as next digit of the result. 
Result so far: 1.0
Deduct 172 from 214 and we're left with 42.
Bring next digit (3) of the dividend behind the 42 and repeat the process: 423 / 172

Going ahead to step 4:
172 goes into 423 2 times with a remainder of 79.
Record the quotient 2 as the next digit in the result. 
Result so far: 12.0
Subtract 344 from 423 to get 79.
Fetch the next digit (2) from the dividend, attach it to 79 and continue: 792 / 172

Moving on to step 5:
172 goes into 792 4 times with a remainder of 104.
The number 4 becomes the next digit in our result. 
Result so far: 124.0
If we take 688 away from 792, we end up with 104.
Fetch the next digit (4) from the dividend, attach it to 104 and continue: 1044 / 172

Going ahead to step 6:
When dividing 1044 by 172, we get 6 with a remainder of 12.
The number 6 becomes the next digit in our result. 
Result so far: 1246.0
If we subtract 1032 from 1044, we get 12.
Append the next digit (2) from the dividend to 12 and continue with: 122 / 172

Moving on to step 7:
172 goes into 122 0 times with a remainder of 122.
The number 0 becomes the next digit in our result. 
Result so far: 12460.0
Subtract 0 from 122 to get 122.
Bring next digit (3) of the dividend behind the 122 and repeat the process: 1223 / 172

Advancing to step 8:
If we divide 1223 by 172, we get 7 and a remainder of 19.
Record the quotient 7 as the next digit in the result. 
Result so far: 124607.0
The remainder is 19 after subtracting 1204 from 1223.
Since there are no more digits in the dividend, we add a zero to the remainder making it 190, and continue the process.

Let's proceed to step 9:
190 divided by 172 is 1 with a remainder of 18.
The number 1 becomes the next digit in our result. 
Result so far: 124607.1
Subtracting 172 from 190 leaves us with 18.
Since there are no more digits in the dividend, we add a zero to the remainder making it 180, and continue the process.

Let's proceed to step 10:
180 divided by 172 is 1 with a remainder of 8.
Use 1 as the next digit of our solution. 
Result so far: 124607.11
Subtracting 172 from 180 leaves us with 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

After the division, we end up with 124607.11 and a remainder of 0.008.