We're dividing 286843 by 15 
The aim is to understand the frequency of 15 in 286843.

Advancing to step 1:
2 divided by 15 is 0 with a remainder of 2.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtracting 0 from 2 leaves us with 2.
Include the next digit (8) from the dividend after 2, then repeat: 28 / 15

Let's proceed to step 2:
The number 15 fits into 28 1 times, leaving a remainder of 13.
The number 1 becomes the next digit in our result. 
Result so far: 1.0
Subtract 15 from 28 to get 13.
Take the next digit (6) from the dividend and append it to 13, then repeat: 136 / 15

On to step 3:
15 goes into 136 9 times with a remainder of 1.
Record the quotient 9 as the next digit in the result. 
Result so far: 19.0
If we subtract 135 from 136, we get 1.
Bring next digit (8) of the dividend behind the 1 and repeat the process: 18 / 15

Advancing to step 4:
15 can be fit into 18 1 times, resulting in a remainder of 3.
The next digit of our result is 1. 
Result so far: 191.0
If we take 15 away from 18, we end up with 3.
Fetch the next digit (4) from the dividend, attach it to 3 and continue: 34 / 15

Step 5:
15 goes into 34 2 times with a remainder of 4.
Write down 2 as next digit of the result. 
Result so far: 1912.0
The remainder is 4 after subtracting 30 from 34.
Include the next digit (3) from the dividend after 4, then repeat: 43 / 15

Advancing to step 6:
When dividing 43 by 15, we get 2 with a remainder of 13.
Use 2 as the next digit of our solution. 
Result so far: 19122.0
Deduct 30 from 43 and we're left with 13.
Since there are no more digits in the dividend, we add a zero to the remainder making it 130, and continue the process.

Moving on to step 7:
15 can be fit into 130 8 times, resulting in a remainder of 10.
Use 8 as the next digit of our solution. 
Result so far: 19122.8
If we take 120 away from 130, we end up with 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Moving on to step 8:
When dividing 100 by 15, we get 6 with a remainder of 10.
Record the quotient 6 as the next digit in the result. 
Result so far: 19122.86
If we subtract 90 from 100, we get 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

On to step 9:
If we divide 100 by 15, we get 6 and a remainder of 10.
Record the quotient 6 as the next digit in the result. 
Result so far: 19122.866
If we take 90 away from 100, we end up with 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

The final result is 19122.866 with a remainder of 0.001.