815241 ÷ 42 
Our goal is to divide 815241 by 42.

On to step 1:
42 can be fit into 8 0 times, resulting in a remainder of 8.
The next digit of our result is 0. 
Result so far: 0.0
Deduct 0 from 8 and we're left with 8.
Grab the next digit (1) from the dividend, add it to 8, then carry on: 81 / 42

Let's proceed to step 2:
42 goes into 81 1 times with a remainder of 39.
The number 1 becomes the next digit in our result. 
Result so far: 1.0
If we subtract 42 from 81, we get 39.
Bring next digit (5) of the dividend behind the 39 and repeat the process: 395 / 42

Step 3:
395 divided by 42 is 9 with a remainder of 17.
Put 9 as the next digit of the answer. 
Result so far: 19.0
Subtracting 378 from 395 leaves us with 17.
Bring next digit (2) of the dividend behind the 17 and repeat the process: 172 / 42

Going ahead to step 4:
42 goes into 172 4 times with a remainder of 4.
The next digit of our result is 4. 
Result so far: 194.0
If we take 168 away from 172, we end up with 4.
Take the next digit (4) from the dividend and append it to 4, then repeat: 44 / 42

Moving on to step 5:
If we divide 44 by 42, we get 1 and a remainder of 2.
The next digit of our result is 1. 
Result so far: 1941.0
The remainder is 2 after subtracting 42 from 44.
Take the next digit (1) from the dividend and append it to 2, then repeat: 21 / 42

Going ahead to step 6:
When dividing 21 by 42, we get 0 with a remainder of 21.
The next digit of our result is 0. 
Result so far: 19410.0
Subtracting 0 from 21 leaves us with 21.
Since there are no more digits in the dividend, we add a zero to the remainder making it 210, and continue the process.

Going ahead to step 7:
If we divide 210 by 42, we get 5 and a remainder of 0.
Record the quotient 5 as the next digit in the result. 
Result so far: 19410.5
Deduct 210 from 210 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.

Moving on to step 8:
42 can be fit into 0 0 times, resulting in a remainder of 0.
Put 0 as the next digit of the answer. 
Result so far: 19410.5
The remainder is 0 after subtracting 0 from 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Advancing to step 9:
The number 42 fits into 0 0 times, leaving a remainder of 0.
Use 0 as the next digit of our solution. 
Result so far: 19410.5
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.

In conclusion, the division gives 19410.5 with a balance of 0.0.