We're dividing 551859 by 78 
We're looking to find how many times 78 goes into 551859.

Let's proceed to step 1:
5 divided by 78 is 0 with a remainder of 5.
The next digit of our result is 0. 
Result so far: 0.0
Subtract 0 from 5 to get 5.
Take the next digit (5) from the dividend and append it to 5, then repeat: 55 / 78

Advancing to step 2:
55 divided by 78 is 0 with a remainder of 55.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Deduct 0 from 55 and we're left with 55.
Take the next digit (1) from the dividend and append it to 55, then repeat: 551 / 78

Step 3:
The number 78 fits into 551 7 times, leaving a remainder of 5.
Put 7 as the next digit of the answer. 
Result so far: 7.0
Subtract 546 from 551 to get 5.
Include the next digit (8) from the dividend after 5, then repeat: 58 / 78

Let's proceed to step 4:
58 divided by 78 is 0 with a remainder of 58.
Use 0 as the next digit of our solution. 
Result so far: 70.0
Deduct 0 from 58 and we're left with 58.
Take the next digit (5) from the dividend and append it to 58, then repeat: 585 / 78

Advancing to step 5:
78 can be fit into 585 7 times, resulting in a remainder of 39.
The next digit of our result is 7. 
Result so far: 707.0
If we take 546 away from 585, we end up with 39.
Take the next digit (9) from the dividend and append it to 39, then repeat: 399 / 78

Moving on to step 6:
78 goes into 399 5 times with a remainder of 9.
The next digit of our result is 5. 
Result so far: 7075.0
If we subtract 390 from 399, we get 9.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

On to step 7:
78 can be fit into 90 1 times, resulting in a remainder of 12.
Record the quotient 1 as the next digit in the result. 
Result so far: 7075.1
If we subtract 78 from 90, we get 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

On to step 8:
78 goes into 120 1 times with a remainder of 42.
Use 1 as the next digit of our solution. 
Result so far: 7075.11
Subtract 78 from 120 to get 42.
Since there are no more digits in the dividend, we add a zero to the remainder making it 420, and continue the process.

The final outcome is 7075.11, with a leftover of 0.042.