Step 1:
The first step to converting 413715621.6449 to a fraction is to re-write 413715621.6449 in the form p/q where p and q are both positive integers. To start with, 413715621.6449 can be written as simply 413715621.6449/1 to technically be written as a fraction.
Step 2:
Next, we will count the number of fractional digits after the decimal point in 413715621.6449, which in this case is 4. For however many digits after the decimal point there are, we will multiply the numerator and denominator of 413715621.6449/1 each by 10 to the power of that many digits. So, in this case, we will multiply the numerator and denominator of 413715621.6449/1 each by 10000:
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 413715621.6449 as a fraction:
413715621/1 / 1