We divide 490687 by 3
The aim is to understand the frequency of 3 in 490687.

Moving on to step 1:
The number 3 fits into 4 1 times, leaving a remainder of 1.
The next digit of our result is 1. 
Result so far: 1.0
Deduct 3 from 4 and we're left with 1.
Include the next digit (9) from the dividend after 1, then repeat: 19 / 3

Step 2:
19 divided by 3 is 6 with a remainder of 1.
Write down 6 as next digit of the result. 
Result so far: 16.0
If we take 18 away from 19, we end up with 1.
Bring next digit (0) of the dividend behind the 1 and repeat the process: 10 / 3

Moving on to step 3:
When dividing 10 by 3, we get 3 with a remainder of 1.
The number 3 becomes the next digit in our result. 
Result so far: 163.0
If we take 9 away from 10, we end up with 1.
Include the next digit (6) from the dividend after 1, then repeat: 16 / 3

Step 4:
When dividing 16 by 3, we get 5 with a remainder of 1.
Use 5 as the next digit of our solution. 
Result so far: 1635.0
Subtract 15 from 16 to get 1.
Take the next digit (8) from the dividend and append it to 1, then repeat: 18 / 3

On to step 5:
When dividing 18 by 3, we get 6 with a remainder of 0.
Record the quotient 6 as the next digit in the result. 
Result so far: 16356.0
Subtracting 18 from 18 leaves us with 0.
Append the next digit (7) from the dividend to 0 and continue with: 7 / 3

Moving on to step 6:
3 goes into 7 2 times with a remainder of 1.
The next digit of our result is 2. 
Result so far: 163562.0
Subtracting 6 from 7 leaves us with 1.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

Let's proceed to step 7:
3 can be fit into 10 3 times, resulting in a remainder of 1.
Write down 3 as next digit of the result. 
Result so far: 163562.3
Subtracting 9 from 10 leaves us with 1.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

Moving on to step 8:
3 goes into 10 3 times with a remainder of 1.
Put 3 as the next digit of the answer. 
Result so far: 163562.33
Subtracting 9 from 10 leaves us with 1.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

The final outcome is 163562.33, with a leftover of 0.001.