Step 1:
The first step to converting 689990.25780902 to a fraction is to re-write 689990.25780902 in the form p/q where p and q are both positive integers. To start with, 689990.25780902 can be written as simply 689990.25780902/1 to technically be written as a fraction.
Step 2:
Next, we will count the number of fractional digits after the decimal point in 689990.25780902, which in this case is 8. For however many digits after the decimal point there are, we will multiply the numerator and denominator of 689990.25780902/1 each by 10 to the power of that many digits. So, in this case, we will multiply the numerator and denominator of 689990.25780902/1 each by 100000000:
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 689990.25780902 as a fraction:
689990/1 / 1