Step 1:
The first step to converting 640290.0360351 to a fraction is to re-write 640290.0360351 in the form p/q where p and q are both positive integers. To start with, 640290.0360351 can be written as simply 640290.0360351/1 to technically be written as a fraction.
Step 2:
Next, we will count the number of fractional digits after the decimal point in 640290.0360351, which in this case is 7. For however many digits after the decimal point there are, we will multiply the numerator and denominator of 640290.0360351/1 each by 10 to the power of that many digits. So, in this case, we will multiply the numerator and denominator of 640290.0360351/1 each by 10000000:
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 640290.0360351 as a fraction:
640290/1 / 1