Step 1:
The first step to converting 64515390.215905 to a fraction is to re-write 64515390.215905 in the form p/q where p and q are both positive integers. To start with, 64515390.215905 can be written as simply 64515390.215905/1 to technically be written as a fraction.
Step 2:
Next, we will count the number of fractional digits after the decimal point in 64515390.215905, which in this case is 6. For however many digits after the decimal point there are, we will multiply the numerator and denominator of 64515390.215905/1 each by 10 to the power of that many digits. So, in this case, we will multiply the numerator and denominator of 64515390.215905/1 each by 1000000:
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 64515390.215905 as a fraction:
64515390/1 / 1