Houston, Jan 3: Indian business magnate Mukesh Ambani is the 18th richest person in the world with a personal wealth of $24.7 billion in 2012, according to the Bloomberg Billionaires Index, a daily ranking of
Microsoft founder Bill Gates and the founder of fashion retailer Zara, Amancio Ortega, rounded out the top three spots, with wealth estimated just over and just under $60 billion, respectively.
