We look at the division of 641713 by 3 
The aim is to understand the frequency of 3 in 641713.

Let's proceed to step 1:
When dividing 6 by 3, we get 2 with a remainder of 0.
Record the quotient 2 as the next digit in the result. 
Result so far: 2.0
The remainder is 0 after subtracting 6 from 6.
Take the next digit (4) from the dividend and append it to 0, then repeat: 4 / 3

Let's proceed to step 2:
When dividing 4 by 3, we get 1 with a remainder of 1.
Record the quotient 1 as the next digit in the result. 
Result so far: 21.0
Deduct 3 from 4 and we're left with 1.
Include the next digit (1) from the dividend after 1, then repeat: 11 / 3

Going ahead to step 3:
3 can be fit into 11 3 times, resulting in a remainder of 2.
Put 3 as the next digit of the answer. 
Result so far: 213.0
Deduct 9 from 11 and we're left with 2.
Fetch the next digit (7) from the dividend, attach it to 2 and continue: 27 / 3

Moving on to step 4:
When dividing 27 by 3, we get 9 with a remainder of 0.
Record the quotient 9 as the next digit in the result. 
Result so far: 2139.0
If we subtract 27 from 27, we get 0.
Append the next digit (1) from the dividend to 0 and continue with: 1 / 3

Advancing to step 5:
3 goes into 1 0 times with a remainder of 1.
Write down 0 as next digit of the result. 
Result so far: 21390.0
Subtract 0 from 1 to get 1.
Bring next digit (3) of the dividend behind the 1 and repeat the process: 13 / 3

Step 6:
The number 3 fits into 13 4 times, leaving a remainder of 1.
Record the quotient 4 as the next digit in the result. 
Result so far: 213904.0
If we subtract 12 from 13, we get 1.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

On to step 7:
3 goes into 10 3 times with a remainder of 1.
The next digit of our result is 3. 
Result so far: 213904.3
If we subtract 9 from 10, we get 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 8:
10 divided by 3 is 3 with a remainder of 1.
The number 3 becomes the next digit in our result. 
Result so far: 213904.33
Subtract 9 from 10 to get 1.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

Our division results in 213904.33 with a remaining 0.001.