We're dividing 15530187 by 423 
The aim is to understand the frequency of 423 in 15530187.

On to step 1:
423 goes into 1 0 times with a remainder of 1.
The next digit of our result is 0. 
Result so far: 0.0
If we take 0 away from 1, we end up with 1.
Fetch the next digit (5) from the dividend, attach it to 1 and continue: 15 / 423

Going ahead to step 2:
The number 423 fits into 15 0 times, leaving a remainder of 15.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we take 0 away from 15, we end up with 15.
Include the next digit (5) from the dividend after 15, then repeat: 155 / 423

Advancing to step 3:
When dividing 155 by 423, we get 0 with a remainder of 155.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtracting 0 from 155 leaves us with 155.
Fetch the next digit (3) from the dividend, attach it to 155 and continue: 1553 / 423

Moving on to step 4:
423 goes into 1553 3 times with a remainder of 284.
Use 3 as the next digit of our solution. 
Result so far: 3.0
Subtract 1269 from 1553 to get 284.
Bring next digit (0) of the dividend behind the 284 and repeat the process: 2840 / 423

Let's proceed to step 5:
423 goes into 2840 6 times with a remainder of 302.
The next digit of our result is 6. 
Result so far: 36.0
Deduct 2538 from 2840 and we're left with 302.
Take the next digit (1) from the dividend and append it to 302, then repeat: 3021 / 423

Going ahead to step 6:
If we divide 3021 by 423, we get 7 and a remainder of 60.
Put 7 as the next digit of the answer. 
Result so far: 367.0
Subtract 2961 from 3021 to get 60.
Take the next digit (8) from the dividend and append it to 60, then repeat: 608 / 423

On to step 7:
The number 423 fits into 608 1 times, leaving a remainder of 185.
Record the quotient 1 as the next digit in the result. 
Result so far: 3671.0
Subtract 423 from 608 to get 185.
Fetch the next digit (7) from the dividend, attach it to 185 and continue: 1857 / 423

Advancing to step 8:
1857 divided by 423 is 4 with a remainder of 165.
Use 4 as the next digit of our solution. 
Result so far: 36714.0
If we subtract 1692 from 1857, we get 165.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1650, and continue the process.

Moving on to step 9:
When dividing 1650 by 423, we get 3 with a remainder of 381.
The next digit of our result is 3. 
Result so far: 36714.3
Subtracting 1269 from 1650 leaves us with 381.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3810, and continue the process.

Advancing to step 10:
423 can be fit into 3810 9 times, resulting in a remainder of 3.
The next digit of our result is 9. 
Result so far: 36714.39
Subtracting 3807 from 3810 leaves us with 3.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

Step 11:
When dividing 30 by 423, we get 0 with a remainder of 30.
Put 0 as the next digit of the answer. 
Result so far: 36714.39
Deduct 0 from 30 and we're left with 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

Going ahead to step 12:
300 divided by 423 is 0 with a remainder of 300.
Write down 0 as next digit of the result. 
Result so far: 36714.39
The remainder is 300 after subtracting 0 from 300.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3000, and continue the process.

The final result is 36714.39 with a remainder of 0.003.