We look at the division of 604921 by 15 
Let's see how many times 15 fits into 604921.

On to step 1:
15 can be fit into 6 0 times, resulting in a remainder of 6.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtract 0 from 6 to get 6.
Grab the next digit (0) from the dividend, add it to 6, then carry on: 60 / 15

Step 2:
When dividing 60 by 15, we get 4 with a remainder of 0.
Record the quotient 4 as the next digit in the result. 
Result so far: 4.0
If we subtract 60 from 60, we get 0.
Fetch the next digit (4) from the dividend, attach it to 0 and continue: 4 / 15

Moving on to step 3:
If we divide 4 by 15, we get 0 and a remainder of 4.
The next digit of our result is 0. 
Result so far: 40.0
The remainder is 4 after subtracting 0 from 4.
Fetch the next digit (9) from the dividend, attach it to 4 and continue: 49 / 15

Advancing to step 4:
If we divide 49 by 15, we get 3 and a remainder of 4.
The next digit of our result is 3. 
Result so far: 403.0
The remainder is 4 after subtracting 45 from 49.
Append the next digit (2) from the dividend to 4 and continue with: 42 / 15

Moving on to step 5:
If we divide 42 by 15, we get 2 and a remainder of 12.
The next digit of our result is 2. 
Result so far: 4032.0
If we subtract 30 from 42, we get 12.
Grab the next digit (1) from the dividend, add it to 12, then carry on: 121 / 15

Moving on to step 6:
15 can be fit into 121 8 times, resulting in a remainder of 1.
Use 8 as the next digit of our solution. 
Result so far: 40328.0
If we take 120 away from 121, 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.

Advancing to step 7:
10 divided by 15 is 0 with a remainder of 10.
Write down 0 as next digit of the result. 
Result so far: 40328.0
Deduct 0 from 10 and we're left with 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Let's proceed to step 8:
When dividing 100 by 15, we get 6 with a remainder of 10.
Put 6 as the next digit of the answer. 
Result so far: 40328.06
Deduct 90 from 100 and we're left with 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

On to step 9:
15 goes into 100 6 times with a remainder of 10.
Put 6 as the next digit of the answer. 
Result so far: 40328.066
Deduct 90 from 100 and we're left with 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

The final outcome is 40328.066, with a leftover of 0.001.