We look at the division of 172390 by 50 
We want to figure out the number of times 172390 can be divided by 50.

Advancing to step 1:
If we divide 1 by 50, we get 0 and a remainder of 1.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we subtract 0 from 1, we get 1.
Include the next digit (7) from the dividend after 1, then repeat: 17 / 50

Step 2:
50 goes into 17 0 times with a remainder of 17.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtract 0 from 17 to get 17.
Bring next digit (2) of the dividend behind the 17 and repeat the process: 172 / 50

Going ahead to step 3:
If we divide 172 by 50, we get 3 and a remainder of 22.
Write down 3 as next digit of the result. 
Result so far: 3.0
Subtracting 150 from 172 leaves us with 22.
Take the next digit (3) from the dividend and append it to 22, then repeat: 223 / 50

Step 4:
50 can be fit into 223 4 times, resulting in a remainder of 23.
The number 4 becomes the next digit in our result. 
Result so far: 34.0
If we take 200 away from 223, we end up with 23.
Grab the next digit (9) from the dividend, add it to 23, then carry on: 239 / 50

Going ahead to step 5:
When dividing 239 by 50, we get 4 with a remainder of 39.
Put 4 as the next digit of the answer. 
Result so far: 344.0
If we subtract 200 from 239, we get 39.
Grab the next digit (0) from the dividend, add it to 39, then carry on: 390 / 50

Moving on to step 6:
50 can be fit into 390 7 times, resulting in a remainder of 40.
Use 7 as the next digit of our solution. 
Result so far: 3447.0
Subtract 350 from 390 to 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.

On to step 7:
When dividing 400 by 50, we get 8 with a remainder of 0.
Write down 8 as next digit of the result. 
Result so far: 3447.8
If we subtract 400 from 400, we get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

On to step 8:
50 goes into 0 0 times with a remainder of 0.
The next digit of our result is 0. 
Result so far: 3447.8
Deduct 0 from 0 and we're left with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Going ahead to step 9:
50 goes into 0 0 times with a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 3447.8
If we subtract 0 from 0, we get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

After the division, we end up with 3447.8 and a remainder of 0.0.