We look at the division of 939403 by 3 
Let's see how many times 3 fits into 939403.

Going ahead to step 1:
When dividing 9 by 3, we get 3 with a remainder of 0.
Put 3 as the next digit of the answer. 
Result so far: 3.0
Deduct 9 from 9 and we're left with 0.
Bring next digit (3) of the dividend behind the 0 and repeat the process: 3 / 3

Let's proceed to step 2:
When dividing 3 by 3, we get 1 with a remainder of 0.
Put 1 as the next digit of the answer. 
Result so far: 31.0
If we subtract 3 from 3, we get 0.
Append the next digit (9) from the dividend to 0 and continue with: 9 / 3

Let's proceed to step 3:
3 can be fit into 9 3 times, resulting in a remainder of 0.
The next digit of our result is 3. 
Result so far: 313.0
If we take 9 away from 9, we end up with 0.
Bring next digit (4) of the dividend behind the 0 and repeat the process: 4 / 3

Going ahead to step 4:
4 divided by 3 is 1 with a remainder of 1.
Write down 1 as next digit of the result. 
Result so far: 3131.0
Subtracting 3 from 4 leaves us with 1.
Append the next digit (0) from the dividend to 1 and continue with: 10 / 3

Moving on to step 5:
10 divided by 3 is 3 with a remainder of 1.
Use 3 as the next digit of our solution. 
Result so far: 31313.0
Deduct 9 from 10 and we're left with 1.
Append the next digit (3) from the dividend to 1 and continue with: 13 / 3

Let's proceed to step 6:
If we divide 13 by 3, we get 4 and a remainder of 1.
Put 4 as the next digit of the answer. 
Result so far: 313134.0
Deduct 12 from 13 and we're left 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.

Step 7:
10 divided by 3 is 3 with a remainder of 1.
Record the quotient 3 as the next digit in the result. 
Result so far: 313134.3
If we take 9 away from 10, we end up 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:
10 divided by 3 is 3 with a remainder of 1.
The next digit of our result is 3. 
Result so far: 313134.33
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.

After the division, we end up with 313134.33 and a remainder of 0.001.