Let's divide 53603904 by 171
The aim is to understand the frequency of 171 in 53603904.

Going ahead to step 1:
171 can be fit into 5 0 times, resulting in a remainder of 5.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtracting 0 from 5 leaves us with 5.
Fetch the next digit (3) from the dividend, attach it to 5 and continue: 53 / 171

Let's proceed to step 2:
53 divided by 171 is 0 with a remainder of 53.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we take 0 away from 53, we end up with 53.
Take the next digit (6) from the dividend and append it to 53, then repeat: 536 / 171

Let's proceed to step 3:
The number 171 fits into 536 3 times, leaving a remainder of 23.
The number 3 becomes the next digit in our result. 
Result so far: 3.0
The remainder is 23 after subtracting 513 from 536.
Take the next digit (0) from the dividend and append it to 23, then repeat: 230 / 171

Step 4:
171 can be fit into 230 1 times, resulting in a remainder of 59.
Use 1 as the next digit of our solution. 
Result so far: 31.0
If we take 171 away from 230, we end up with 59.
Include the next digit (3) from the dividend after 59, then repeat: 593 / 171

Advancing to step 5:
593 divided by 171 is 3 with a remainder of 80.
The next digit of our result is 3. 
Result so far: 313.0
If we take 513 away from 593, we end up with 80.
Append the next digit (9) from the dividend to 80 and continue with: 809 / 171

Moving on to step 6:
The number 171 fits into 809 4 times, leaving a remainder of 125.
The number 4 becomes the next digit in our result. 
Result so far: 3134.0
The remainder is 125 after subtracting 684 from 809.
Take the next digit (0) from the dividend and append it to 125, then repeat: 1250 / 171

Advancing to step 7:
171 goes into 1250 7 times with a remainder of 53.
Use 7 as the next digit of our solution. 
Result so far: 31347.0
If we take 1197 away from 1250, we end up with 53.
Grab the next digit (4) from the dividend, add it to 53, then carry on: 534 / 171

Moving on to step 8:
If we divide 534 by 171, we get 3 and a remainder of 21.
Record the quotient 3 as the next digit in the result. 
Result so far: 313473.0
If we take 513 away from 534, we end up with 21.
Since there are no more digits in the dividend, we add a zero to the remainder making it 210, and continue the process.

Advancing to step 9:
171 goes into 210 1 times with a remainder of 39.
Put 1 as the next digit of the answer. 
Result so far: 313473.1
Subtracting 171 from 210 leaves us with 39.
Since there are no more digits in the dividend, we add a zero to the remainder making it 390, and continue the process.

Moving on to step 10:
171 can be fit into 390 2 times, resulting in a remainder of 48.
The next digit of our result is 2. 
Result so far: 313473.12
If we subtract 342 from 390, we get 48.
Since there are no more digits in the dividend, we add a zero to the remainder making it 480, and continue the process.

Going ahead to step 11:
When dividing 480 by 171, we get 2 with a remainder of 138.
Record the quotient 2 as the next digit in the result. 
Result so far: 313473.122
If we take 342 away from 480, we end up with 138.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1380, and continue the process.

The final result is 313473.122 with a remainder of 0.0138.