We look at the division of 53415973 by 172 
We want to figure out the number of times 53415973 can be divided by 172.

Let's proceed to step 1:
172 can be fit into 5 0 times, resulting in a remainder of 5.
Write down 0 as next digit of the result. 
Result so far: 0.0
The remainder is 5 after subtracting 0 from 5.
Append the next digit (3) from the dividend to 5 and continue with: 53 / 172

On to step 2:
172 goes into 53 0 times with a remainder of 53.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtracting 0 from 53 leaves us with 53.
Take the next digit (4) from the dividend and append it to 53, then repeat: 534 / 172

Step 3:
When dividing 534 by 172, we get 3 with a remainder of 18.
Use 3 as the next digit of our solution. 
Result so far: 3.0
If we take 516 away from 534, we end up with 18.
Include the next digit (1) from the dividend after 18, then repeat: 181 / 172

Moving on to step 4:
The number 172 fits into 181 1 times, leaving a remainder of 9.
Write down 1 as next digit of the result. 
Result so far: 31.0
Subtracting 172 from 181 leaves us with 9.
Include the next digit (5) from the dividend after 9, then repeat: 95 / 172

Going ahead to step 5:
If we divide 95 by 172, we get 0 and a remainder of 95.
The number 0 becomes the next digit in our result. 
Result so far: 310.0
If we take 0 away from 95, we end up with 95.
Take the next digit (9) from the dividend and append it to 95, then repeat: 959 / 172

Going ahead to step 6:
When dividing 959 by 172, we get 5 with a remainder of 99.
Put 5 as the next digit of the answer. 
Result so far: 3105.0
Subtracting 860 from 959 leaves us with 99.
Append the next digit (7) from the dividend to 99 and continue with: 997 / 172

Going ahead to step 7:
When dividing 997 by 172, we get 5 with a remainder of 137.
The next digit of our result is 5. 
Result so far: 31055.0
Deduct 860 from 997 and we're left with 137.
Grab the next digit (3) from the dividend, add it to 137, then carry on: 1373 / 172

Advancing to step 8:
172 can be fit into 1373 7 times, resulting in a remainder of 169.
Write down 7 as next digit of the result. 
Result so far: 310557.0
If we subtract 1204 from 1373, we get 169.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1690, and continue the process.

Moving on to step 9:
If we divide 1690 by 172, we get 9 and a remainder of 142.
Use 9 as the next digit of our solution. 
Result so far: 310557.9
The remainder is 142 after subtracting 1548 from 1690.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1420, and continue the process.

Step 10:
When dividing 1420 by 172, we get 8 with a remainder of 44.
The number 8 becomes the next digit in our result. 
Result so far: 310557.98
If we take 1376 away from 1420, we end up with 44.
Since there are no more digits in the dividend, we add a zero to the remainder making it 440, and continue the process.

Let's proceed to step 11:
440 divided by 172 is 2 with a remainder of 96.
The number 2 becomes the next digit in our result. 
Result so far: 310557.982
Subtracting 344 from 440 leaves us with 96.
Since there are no more digits in the dividend, we add a zero to the remainder making it 960, and continue the process.

Moving on to step 12:
172 can be fit into 960 5 times, resulting in a remainder of 100.
The number 5 becomes the next digit in our result. 
Result so far: 310557.9825
Subtract 860 from 960 to get 100.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1000, and continue the process.

Advancing to step 13:
172 can be fit into 1000 5 times, resulting in a remainder of 140.
Put 5 as the next digit of the answer. 
Result so far: 310557.98255
The remainder is 140 after subtracting 860 from 1000.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1400, and continue the process.

The final outcome is 310557.98255, with a leftover of 0.00014.