We look at the division of 903864 by 3 
We're looking to find how many times 3 goes into 903864.

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 (0) of the dividend behind the 0 and repeat the process: 0 / 3

Moving on to step 2:
3 can be fit into 0 0 times, resulting in a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 30.0
Deduct 0 from 0 and we're left with 0.
Fetch the next digit (3) from the dividend, attach it to 0 and continue: 3 / 3

Step 3:
3 divided by 3 is 1 with a remainder of 0.
Write down 1 as next digit of the result. 
Result so far: 301.0
Subtract 3 from 3 to get 0.
Bring next digit (8) of the dividend behind the 0 and repeat the process: 8 / 3

Advancing to step 4:
3 goes into 8 2 times with a remainder of 2.
The next digit of our result is 2. 
Result so far: 3012.0
Subtracting 6 from 8 leaves us with 2.
Take the next digit (6) from the dividend and append it to 2, then repeat: 26 / 3

Let's proceed to step 5:
The number 3 fits into 26 8 times, leaving a remainder of 2.
Use 8 as the next digit of our solution. 
Result so far: 30128.0
Subtracting 24 from 26 leaves us with 2.
Append the next digit (4) from the dividend to 2 and continue with: 24 / 3

Step 6:
3 goes into 24 8 times with a remainder of 0.
Write down 8 as next digit of the result. 
Result so far: 301288.0
The remainder is 0 after subtracting 24 from 24.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Moving on to step 7:
The number 3 fits into 0 0 times, leaving a remainder of 0.
Use 0 as the next digit of our solution. 
Result so far: 301288.0
Subtracting 0 from 0 leaves us with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Moving on to step 8:
When dividing 0 by 3, we get 0 with a remainder of 0.
Put 0 as the next digit of the answer. 
Result so far: 301288.0
Deduct 0 from 0 and we're left with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

In conclusion, the division gives 301288.0 with a balance of 0.0.