We're dividing 51238870 by 45 
We want to divide 51238870 by 45.

Let's proceed to step 1:
When dividing 5 by 45, we get 0 with a remainder of 5.
The next digit of our result is 0. 
Result so far: 0.0
Deduct 0 from 5 and we're left with 5.
Fetch the next digit (1) from the dividend, attach it to 5 and continue: 51 / 45

Moving on to step 2:
45 goes into 51 1 times with a remainder of 6.
The next digit of our result is 1. 
Result so far: 1.0
Subtract 45 from 51 to get 6.
Append the next digit (2) from the dividend to 6 and continue with: 62 / 45

On to step 3:
62 divided by 45 is 1 with a remainder of 17.
Record the quotient 1 as the next digit in the result. 
Result so far: 11.0
If we subtract 45 from 62, we get 17.
Fetch the next digit (3) from the dividend, attach it to 17 and continue: 173 / 45

Moving on to step 4:
45 goes into 173 3 times with a remainder of 38.
Use 3 as the next digit of our solution. 
Result so far: 113.0
Deduct 135 from 173 and we're left with 38.
Append the next digit (8) from the dividend to 38 and continue with: 388 / 45

On to step 5:
45 goes into 388 8 times with a remainder of 28.
Record the quotient 8 as the next digit in the result. 
Result so far: 1138.0
Deduct 360 from 388 and we're left with 28.
Fetch the next digit (8) from the dividend, attach it to 28 and continue: 288 / 45

Going ahead to step 6:
The number 45 fits into 288 6 times, leaving a remainder of 18.
Put 6 as the next digit of the answer. 
Result so far: 11386.0
The remainder is 18 after subtracting 270 from 288.
Take the next digit (7) from the dividend and append it to 18, then repeat: 187 / 45

Step 7:
45 goes into 187 4 times with a remainder of 7.
Write down 4 as next digit of the result. 
Result so far: 113864.0
Subtracting 180 from 187 leaves us with 7.
Fetch the next digit (0) from the dividend, attach it to 7 and continue: 70 / 45

Going ahead to step 8:
When dividing 70 by 45, we get 1 with a remainder of 25.
The next digit of our result is 1. 
Result so far: 1138641.0
If we subtract 45 from 70, we get 25.
Since there are no more digits in the dividend, we add a zero to the remainder making it 250, and continue the process.

Going ahead to step 9:
The number 45 fits into 250 5 times, leaving a remainder of 25.
Record the quotient 5 as the next digit in the result. 
Result so far: 1138641.5
Deduct 225 from 250 and we're left with 25.
Since there are no more digits in the dividend, we add a zero to the remainder making it 250, and continue the process.

Let's proceed to step 10:
45 can be fit into 250 5 times, resulting in a remainder of 25.
Use 5 as the next digit of our solution. 
Result so far: 1138641.55
Deduct 225 from 250 and we're left with 25.
Since there are no more digits in the dividend, we add a zero to the remainder making it 250, and continue the process.

In conclusion, the division gives 1138641.55 with a balance of 0.025.