Let's divide 287687 by 3
The aim is to understand the frequency of 3 in 287687.

Going ahead to step 1:
If we divide 2 by 3, we get 0 and 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 / 3

On to step 2:
If we divide 28 by 3, we get 9 and a remainder of 1.
The number 9 becomes the next digit in our result. 
Result so far: 9.0
If we subtract 27 from 28, we get 1.
Include the next digit (7) from the dividend after 1, then repeat: 17 / 3

Moving on to step 3:
The number 3 fits into 17 5 times, leaving a remainder of 2.
Use 5 as the next digit of our solution. 
Result so far: 95.0
If we subtract 15 from 17, we get 2.
Include the next digit (6) from the dividend after 2, then repeat: 26 / 3

On to step 4:
If we divide 26 by 3, we get 8 and a remainder of 2.
Use 8 as the next digit of our solution. 
Result so far: 958.0
Subtract 24 from 26 to get 2.
Fetch the next digit (8) from the dividend, attach it to 2 and continue: 28 / 3

Advancing to step 5:
3 goes into 28 9 times with a remainder of 1.
The next digit of our result is 9. 
Result so far: 9589.0
The remainder is 1 after subtracting 27 from 28.
Include the next digit (7) from the dividend after 1, then repeat: 17 / 3

On to step 6:
17 divided by 3 is 5 with a remainder of 2.
Use 5 as the next digit of our solution. 
Result so far: 95895.0
Subtract 15 from 17 to get 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Let's proceed to step 7:
The number 3 fits into 20 6 times, leaving a remainder of 2.
The number 6 becomes the next digit in our result. 
Result so far: 95895.6
Subtract 18 from 20 to get 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Going ahead to step 8:
3 can be fit into 20 6 times, resulting in a remainder of 2.
Put 6 as the next digit of the answer. 
Result so far: 95895.66
If we subtract 18 from 20, we get 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

The final outcome is 95895.66, with a leftover of 0.002.