78258553 ÷ 102 
Our goal is to divide 78258553 by 102.

Moving on to step 1:
102 goes into 7 0 times with a remainder of 7.
The next digit of our result is 0. 
Result so far: 0.0
Subtract 0 from 7 to get 7.
Bring next digit (8) of the dividend behind the 7 and repeat the process: 78 / 102

Advancing to step 2:
78 divided by 102 is 0 with a remainder of 78.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Deduct 0 from 78 and we're left with 78.
Append the next digit (2) from the dividend to 78 and continue with: 782 / 102

Let's proceed to step 3:
If we divide 782 by 102, we get 7 and a remainder of 68.
Record the quotient 7 as the next digit in the result. 
Result so far: 7.0
If we subtract 714 from 782, we get 68.
Append the next digit (5) from the dividend to 68 and continue with: 685 / 102

Step 4:
The number 102 fits into 685 6 times, leaving a remainder of 73.
Put 6 as the next digit of the answer. 
Result so far: 76.0
Subtract 612 from 685 to get 73.
Bring next digit (8) of the dividend behind the 73 and repeat the process: 738 / 102

Step 5:
The number 102 fits into 738 7 times, leaving a remainder of 24.
The next digit of our result is 7. 
Result so far: 767.0
Subtracting 714 from 738 leaves us with 24.
Take the next digit (5) from the dividend and append it to 24, then repeat: 245 / 102

Let's proceed to step 6:
When dividing 245 by 102, we get 2 with a remainder of 41.
The next digit of our result is 2. 
Result so far: 7672.0
Subtract 204 from 245 to get 41.
Take the next digit (5) from the dividend and append it to 41, then repeat: 415 / 102

Moving on to step 7:
If we divide 415 by 102, we get 4 and a remainder of 7.
Put 4 as the next digit of the answer. 
Result so far: 76724.0
If we take 408 away from 415, we end up with 7.
Append the next digit (3) from the dividend to 7 and continue with: 73 / 102

Going ahead to step 8:
When dividing 73 by 102, we get 0 with a remainder of 73.
Record the quotient 0 as the next digit in the result. 
Result so far: 767240.0
The remainder is 73 after subtracting 0 from 73.
Since there are no more digits in the dividend, we add a zero to the remainder making it 730, and continue the process.

Let's proceed to step 9:
102 goes into 730 7 times with a remainder of 16.
Write down 7 as next digit of the result. 
Result so far: 767240.7
The remainder is 16 after subtracting 714 from 730.
Since there are no more digits in the dividend, we add a zero to the remainder making it 160, and continue the process.

Let's proceed to step 10:
If we divide 160 by 102, we get 1 and a remainder of 58.
Write down 1 as next digit of the result. 
Result so far: 767240.71
If we take 102 away from 160, we end up with 58.
Since there are no more digits in the dividend, we add a zero to the remainder making it 580, and continue the process.

Step 11:
102 goes into 580 5 times with a remainder of 70.
Use 5 as the next digit of our solution. 
Result so far: 767240.715
If we take 510 away from 580, we end up with 70.
Since there are no more digits in the dividend, we add a zero to the remainder making it 700, and continue the process.

Advancing to step 12:
When dividing 700 by 102, we get 6 with a remainder of 88.
Use 6 as the next digit of our solution. 
Result so far: 767240.7156
Subtract 612 from 700 to get 88.
Since there are no more digits in the dividend, we add a zero to the remainder making it 880, and continue the process.

Let's proceed to step 13:
When dividing 880 by 102, we get 8 with a remainder of 64.
Record the quotient 8 as the next digit in the result. 
Result so far: 767240.71568
Subtract 816 from 880 to get 64.
Since there are no more digits in the dividend, we add a zero to the remainder making it 640, and continue the process.

Step 14:
When dividing 640 by 102, we get 6 with a remainder of 28.
Use 6 as the next digit of our solution. 
Result so far: 767240.715686
Subtracting 612 from 640 leaves us with 28.
Since there are no more digits in the dividend, we add a zero to the remainder making it 280, and continue the process.

Going ahead to step 15:
When dividing 280 by 102, we get 2 with a remainder of 76.
The next digit of our result is 2. 
Result so far: 767240.7156862
Deduct 204 from 280 and we're left with 76.
Since there are no more digits in the dividend, we add a zero to the remainder making it 760, and continue the process.

Let's proceed to step 16:
102 goes into 760 7 times with a remainder of 46.
Use 7 as the next digit of our solution. 
Result so far: 767240.71568627
Subtract 714 from 760 to get 46.
Since there are no more digits in the dividend, we add a zero to the remainder making it 460, and continue the process.

The final outcome is 767240.71568627, with a leftover of 4.6e-08.