We're dividing 172081 by 423 
Our goal is to divide 172081 by 423.

Going ahead to step 1:
The number 423 fits into 1 0 times, leaving a remainder of 1.
Write down 0 as next digit of the result. 
Result so far: 0.0
Deduct 0 from 1 and we're left with 1.
Append the next digit (7) from the dividend to 1 and continue with: 17 / 423

On to step 2:
If we divide 17 by 423, we get 0 and a remainder of 17.
The next digit of our result is 0. 
Result so far: 0.0
If we take 0 away from 17, we end up with 17.
Grab the next digit (2) from the dividend, add it to 17, then carry on: 172 / 423

On to step 3:
423 goes into 172 0 times with a remainder of 172.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
The remainder is 172 after subtracting 0 from 172.
Include the next digit (0) from the dividend after 172, then repeat: 1720 / 423

On to step 4:
423 can be fit into 1720 4 times, resulting in a remainder of 28.
Write down 4 as next digit of the result. 
Result so far: 4.0
Subtract 1692 from 1720 to get 28.
Take the next digit (8) from the dividend and append it to 28, then repeat: 288 / 423

Step 5:
423 goes into 288 0 times with a remainder of 288.
The next digit of our result is 0. 
Result so far: 40.0
Subtracting 0 from 288 leaves us with 288.
Bring next digit (1) of the dividend behind the 288 and repeat the process: 2881 / 423

Advancing to step 6:
2881 divided by 423 is 6 with a remainder of 343.
The number 6 becomes the next digit in our result. 
Result so far: 406.0
Subtract 2538 from 2881 to get 343.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3430, and continue the process.

Step 7:
423 can be fit into 3430 8 times, resulting in a remainder of 46.
Put 8 as the next digit of the answer. 
Result so far: 406.8
If we subtract 3384 from 3430, we get 46.
Since there are no more digits in the dividend, we add a zero to the remainder making it 460, and continue the process.

Let's proceed to step 8:
423 can be fit into 460 1 times, resulting in a remainder of 37.
The next digit of our result is 1. 
Result so far: 406.81
Deduct 423 from 460 and we're left with 37.
Since there are no more digits in the dividend, we add a zero to the remainder making it 370, and continue the process.

On to step 9:
When dividing 370 by 423, we get 0 with a remainder of 370.
Put 0 as the next digit of the answer. 
Result so far: 406.81
Subtracting 0 from 370 leaves us with 370.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3700, and continue the process.

Let's proceed to step 10:
3700 divided by 423 is 8 with a remainder of 316.
Use 8 as the next digit of our solution. 
Result so far: 406.8108
The remainder is 316 after subtracting 3384 from 3700.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3160, and continue the process.

Step 11:
The number 423 fits into 3160 7 times, leaving a remainder of 199.
Use 7 as the next digit of our solution. 
Result so far: 406.81087
If we take 2961 away from 3160, we end up with 199.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1990, and continue the process.

Moving on to step 12:
423 can be fit into 1990 4 times, resulting in a remainder of 298.
The number 4 becomes the next digit in our result. 
Result so far: 406.810874
Subtract 1692 from 1990 to get 298.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2980, and continue the process.

Going ahead to step 13:
2980 divided by 423 is 7 with a remainder of 19.
Write down 7 as next digit of the result. 
Result so far: 406.8108747
Deduct 2961 from 2980 and we're left with 19.
Since there are no more digits in the dividend, we add a zero to the remainder making it 190, and continue the process.

Moving on to step 14:
423 can be fit into 190 0 times, resulting in a remainder of 190.
The number 0 becomes the next digit in our result. 
Result so far: 406.8108747
If we subtract 0 from 190, we get 190.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1900, and continue the process.

The final result is 406.8108747 with a remainder of 1.9e-07.