Step 1:
The first step to converting 915406648.63678 to a fraction is to re-write 915406648.63678 in the form p/q where p and q are both positive integers. To start with, 915406648.63678 can be written as simply 915406648.63678/1 to technically be written as a fraction.
Step 2:
Next, we will count the number of fractional digits after the decimal point in 915406648.63678, which in this case is 5. For however many digits after the decimal point there are, we will multiply the numerator and denominator of 915406648.63678/1 each by 10 to the power of that many digits. So, in this case, we will multiply the numerator and denominator of 915406648.63678/1 each by 100000:
Step 3:
Now the last step is to simplify the fraction (if possible) by finding similar factors and cancelling them out, which leads to the following answer for 915406648.63678 as a fraction:
915406648/1 / 1