Step 1:
The first step to converting 61440.515911816 to a fraction is to re-write 61440.515911816 in the form p/q where p and q are both positive integers. To start with, 61440.515911816 can be written as simply 61440.515911816/1 to technically be written as a fraction.
Step 2:
Next, we will count the number of fractional digits after the decimal point in 61440.515911816, which in this case is 9. For however many digits after the decimal point there are, we will multiply the numerator and denominator of 61440.515911816/1 each by 10 to the power of that many digits. So, in this case, we will multiply the numerator and denominator of 61440.515911816/1 each by 1000000000:
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 61440.515911816 as a fraction:
122881/2 / 1