Michael Dell has become the world's fifth-richest person.SAUL LOEB / AFP via Getty ImagesOld-school tech founder Michael Dell is shaking up the wealth rankings.The Dell Technologies chief is now richer than Jensen Huang, Mark Zuckerberg, and Larry Ellison.Dell stock has tripled this year on the back of soaring sales of AI computing equipment.Dell computers might not be flashy, but there's nothing dull about Michael Dell right now.The founder and…