Steve you are making me work in a way that is alien to my normal trial and effort approach, still I'll have a go.
Problem. We cannot move the fulcrum point. Solution. Leave it where it is.
Lever the stone up as far as possible, then insert packing logs between the stone (stone side) and the fulcrum. This will bring the contact point of the levers (now acting against the packing) back towards the fulcrum. Continue and repeat as necessary.
The distance to be covered cannot be much more than 3 or 4 feet.
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