We have to find the amount of money raised by all three schools.
The first school: EON, raised $286.00
The second school: Hackett raised $192.84
The third school: Myers raised $113.25 more than Hackett
To calculate the amount that the third school raised, we add $113.25 to the amount that the second school raised $192.84:

Myers raised $306.09
Finally, we add the money that the three schools raised to find the total:

The total amount of money raised was $784.93
Answer:
$784.93