Meredith’s unloading of storied Fortune magazine to a Thai businessman is the latest in a string of personal private investments in major media publications by assorted billionaires, and one of the biggest ever to a foreign investor. Chatchaval Jiaravanon, a Bangkok-based tycoon with an undergraduate business degree from the University of Southern California, is buying Fortune for $150 million in cash.Who is he?Meredith, the Des Moines-based publisher, described Jiaravanon as “at the helm” of a head-spinning portfolio of public companies — including board positions at True Corporation, Ticon Industrial Connection………….