Step 1:
The first step to converting 7820.815670293 to a fraction is to re-write 7820.815670293 in the form p/q where p and q are both positive integers. To start with, 7820.815670293 can be written as simply 7820.815670293/1 to technically be written as a fraction.
Step 2:
Next, we will count the number of fractional digits after the decimal point in 7820.815670293, which in this case is 9. For however many digits after the decimal point there are, we will multiply the numerator and denominator of 7820.815670293/1 each by 10 to the power of that many digits. So, in this case, we will multiply the numerator and denominator of 7820.815670293/1 each by 1000000000:
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 7820.815670293 as a fraction:
86029/11 / 1