Step 1:
The first step to converting 290478.77686869 to a fraction is to re-write 290478.77686869 in the form p/q where p and q are both positive integers. To start with, 290478.77686869 can be written as simply 290478.77686869/1 to technically be written as a fraction.
Step 2:
Next, we will count the number of fractional digits after the decimal point in 290478.77686869, which in this case is 8. For however many digits after the decimal point there are, we will multiply the numerator and denominator of 290478.77686869/1 each by 10 to the power of that many digits. So, in this case, we will multiply the numerator and denominator of 290478.77686869/1 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 290478.77686869 as a fraction:
290479/1 / 1