We look at the division of 3703007 by 3 
The aim is to understand the frequency of 3 in 3703007.

Advancing to step 1:
3 goes into 3 1 times with a remainder of 0.
Write down 1 as next digit of the result. 
Result so far: 1.0
Deduct 3 from 3 and we're left with 0.
Take the next digit (7) from the dividend and append it to 0, then repeat: 7 / 3

Moving on to step 2:
3 can be fit into 7 2 times, resulting in a remainder of 1.
The next digit of our result is 2. 
Result so far: 12.0
If we subtract 6 from 7, we get 1.
Fetch the next digit (0) from the dividend, attach it to 1 and continue: 10 / 3

Step 3:
If we divide 10 by 3, we get 3 and a remainder of 1.
Use 3 as the next digit of our solution. 
Result so far: 123.0
Deduct 9 from 10 and we're left with 1.
Bring next digit (3) of the dividend behind the 1 and repeat the process: 13 / 3

Moving on to step 4:
The number 3 fits into 13 4 times, leaving a remainder of 1.
Write down 4 as next digit of the result. 
Result so far: 1234.0
If we subtract 12 from 13, we get 1.
Include the next digit (0) from the dividend after 1, then repeat: 10 / 3

Step 5:
The number 3 fits into 10 3 times, leaving a remainder of 1.
Put 3 as the next digit of the answer. 
Result so far: 12343.0
If we subtract 9 from 10, we get 1.
Include the next digit (0) from the dividend after 1, then repeat: 10 / 3

Let's proceed to step 6:
3 can be fit into 10 3 times, resulting in a remainder of 1.
Put 3 as the next digit of the answer. 
Result so far: 123433.0
The remainder is 1 after subtracting 9 from 10.
Grab the next digit (7) from the dividend, add it to 1, then carry on: 17 / 3

Let's proceed to step 7:
When dividing 17 by 3, we get 5 with a remainder of 2.
Use 5 as the next digit of our solution. 
Result so far: 1234335.0
Subtracting 15 from 17 leaves us with 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

On to step 8:
20 divided by 3 is 6 with a remainder of 2.
The number 6 becomes the next digit in our result. 
Result so far: 1234335.6
Subtracting 18 from 20 leaves us with 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 9:
If we divide 20 by 3, we get 6 and a remainder of 2.
Use 6 as the next digit of our solution. 
Result so far: 1234335.66
If we take 18 away from 20, we end up with 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

After the division, we end up with 1234335.66 and a remainder of 0.002.