If your floorboard is leaking it is most likely rust that has built a whole into the floorboard. To fix this you need to take it to a body shop where they will either weld a new piece of metal in for you or replace the entire floorboard at once.
This leak may actually be coming from your heater core, which is usually located behind the center console. Check to see if the liquid smells like antifreeze and if it does this is probably a leak in the heater core.