53548594 ÷ 678 
Our goal is to divide 53548594 by 678.

Advancing to step 1:
The number 678 fits into 5 0 times, leaving a remainder of 5.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtract 0 from 5 to get 5.
Include the next digit (3) from the dividend after 5, then repeat: 53 / 678

Step 2:
678 can be fit into 53 0 times, resulting in a remainder of 53.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtracting 0 from 53 leaves us with 53.
Include the next digit (5) from the dividend after 53, then repeat: 535 / 678

Advancing to step 3:
When dividing 535 by 678, we get 0 with a remainder of 535.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we take 0 away from 535, we end up with 535.
Append the next digit (4) from the dividend to 535 and continue with: 5354 / 678

Let's proceed to step 4:
5354 divided by 678 is 7 with a remainder of 608.
The next digit of our result is 7. 
Result so far: 7.0
The remainder is 608 after subtracting 4746 from 5354.
Grab the next digit (8) from the dividend, add it to 608, then carry on: 6088 / 678

Step 5:
6088 divided by 678 is 8 with a remainder of 664.
Record the quotient 8 as the next digit in the result. 
Result so far: 78.0
Subtract 5424 from 6088 to get 664.
Grab the next digit (5) from the dividend, add it to 664, then carry on: 6645 / 678

Moving on to step 6:
When dividing 6645 by 678, we get 9 with a remainder of 543.
Record the quotient 9 as the next digit in the result. 
Result so far: 789.0
Deduct 6102 from 6645 and we're left with 543.
Fetch the next digit (9) from the dividend, attach it to 543 and continue: 5439 / 678

Advancing to step 7:
678 can be fit into 5439 8 times, resulting in a remainder of 15.
Write down 8 as next digit of the result. 
Result so far: 7898.0
The remainder is 15 after subtracting 5424 from 5439.
Take the next digit (4) from the dividend and append it to 15, then repeat: 154 / 678

Advancing to step 8:
If we divide 154 by 678, we get 0 and a remainder of 154.
The number 0 becomes the next digit in our result. 
Result so far: 78980.0
The remainder is 154 after subtracting 0 from 154.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1540, and continue the process.

Moving on to step 9:
678 goes into 1540 2 times with a remainder of 184.
Record the quotient 2 as the next digit in the result. 
Result so far: 78980.2
Subtracting 1356 from 1540 leaves us with 184.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1840, and continue the process.

On to step 10:
The number 678 fits into 1840 2 times, leaving a remainder of 484.
Record the quotient 2 as the next digit in the result. 
Result so far: 78980.22
If we subtract 1356 from 1840, we get 484.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4840, and continue the process.

The final outcome is 78980.22, with a leftover of 0.484.