863448 ÷ 15 
Our goal is to divide 863448 by 15.

Moving on to step 1:
When dividing 8 by 15, we get 0 with a remainder of 8.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtracting 0 from 8 leaves us with 8.
Take the next digit (6) from the dividend and append it to 8, then repeat: 86 / 15

Step 2:
The number 15 fits into 86 5 times, leaving a remainder of 11.
Write down 5 as next digit of the result. 
Result so far: 5.0
If we take 75 away from 86, we end up with 11.
Bring next digit (3) of the dividend behind the 11 and repeat the process: 113 / 15

Going ahead to step 3:
113 divided by 15 is 7 with a remainder of 8.
Use 7 as the next digit of our solution. 
Result so far: 57.0
Subtract 105 from 113 to get 8.
Grab the next digit (4) from the dividend, add it to 8, then carry on: 84 / 15

Advancing to step 4:
15 goes into 84 5 times with a remainder of 9.
Write down 5 as next digit of the result. 
Result so far: 575.0
Deduct 75 from 84 and we're left with 9.
Take the next digit (4) from the dividend and append it to 9, then repeat: 94 / 15

Let's proceed to step 5:
If we divide 94 by 15, we get 6 and a remainder of 4.
Record the quotient 6 as the next digit in the result. 
Result so far: 5756.0
If we take 90 away from 94, we end up with 4.
Grab the next digit (8) from the dividend, add it to 4, then carry on: 48 / 15

On to step 6:
15 goes into 48 3 times with a remainder of 3.
Record the quotient 3 as the next digit in the result. 
Result so far: 57563.0
Deduct 45 from 48 and we're left with 3.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

Let's proceed to step 7:
15 goes into 30 2 times with a remainder of 0.
Put 2 as the next digit of the answer. 
Result so far: 57563.2
If we take 30 away from 30, we end up 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.

Step 8:
The number 15 fits into 0 0 times, leaving a remainder of 0.
Use 0 as the next digit of our solution. 
Result so far: 57563.2
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.

Step 9:
If we divide 0 by 15, we get 0 and a remainder of 0.
The number 0 becomes the next digit in our result. 
Result so far: 57563.2
Subtract 0 from 0 to get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

The final result is 57563.2 with a remainder of 0.0.