78274 divided by 21 
Let's see how many times 21 fits into 78274.

Step 1:
21 can be fit into 7 0 times, resulting in a remainder of 7.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtract 0 from 7 to get 7.
Take the next digit (8) from the dividend and append it to 7, then repeat: 78 / 21

Going ahead to step 2:
When dividing 78 by 21, we get 3 with a remainder of 15.
Use 3 as the next digit of our solution. 
Result so far: 3.0
The remainder is 15 after subtracting 63 from 78.
Grab the next digit (2) from the dividend, add it to 15, then carry on: 152 / 21

Advancing to step 3:
21 goes into 152 7 times with a remainder of 5.
The next digit of our result is 7. 
Result so far: 37.0
Subtract 147 from 152 to get 5.
Take the next digit (7) from the dividend and append it to 5, then repeat: 57 / 21

On to step 4:
21 goes into 57 2 times with a remainder of 15.
Put 2 as the next digit of the answer. 
Result so far: 372.0
If we subtract 42 from 57, we get 15.
Bring next digit (4) of the dividend behind the 15 and repeat the process: 154 / 21

Step 5:
If we divide 154 by 21, we get 7 and a remainder of 7.
Put 7 as the next digit of the answer. 
Result so far: 3727.0
Deduct 147 from 154 and we're left with 7.
Since there are no more digits in the dividend, we add a zero to the remainder making it 70, and continue the process.

Let's proceed to step 6:
If we divide 70 by 21, we get 3 and a remainder of 7.
Use 3 as the next digit of our solution. 
Result so far: 3727.3
The remainder is 7 after subtracting 63 from 70.
Since there are no more digits in the dividend, we add a zero to the remainder making it 70, and continue the process.

Moving on to step 7:
21 can be fit into 70 3 times, resulting in a remainder of 7.
Write down 3 as next digit of the result. 
Result so far: 3727.33
The remainder is 7 after subtracting 63 from 70.
Since there are no more digits in the dividend, we add a zero to the remainder making it 70, and continue the process.

The quotient of the division is 3727.33, and the remainder is 0.007.