The trick is to make use of your right hand.
Measure 24, I play the chord as 1-2-4, then during the first two beats I switch to holding the whole notes down with my 3rd and 5th fingers. It's a bit tricky at first, but once your get the switch down it frees up the RH fingers 1 & 2 to help with the Bass.
So, the Bass clef part is fingered as: (RH fingers will be bolded)
5213 - 2352 - 1 123 - 431
There's several other places where the RH can come in handy:
Measures 7 & 10, the RH can play the top note (F#) with the thumb, this also sets up the RH for the next measure because the thumb will already be in place.
Also, if you find your LH getting tired, the RH can definitely take part when it doesn't have to cover the melody. Go ahead and experiment, but making full use of your all 10 fingers will definitely make the prelude much smoother.