Oil and gas tycoon Mukesh Ambani's net worth has jumped to $31.3 billion making him the 20th richest person on the planet. Ambani was ranked at number 33 with a fortune of $23.2 billion in the Forbes 2017 Billionaires List, which was published in March. Last September, Ambani launched 4G service Jio and went on to notch up 100 million customers by the end of March. That year, he featured among the top 5 richest in the world with a net worth of $43 billion. By 2012, he had slipped to number 19 and thereafter fell off from the top 20 altogether.

Source: Forbes April 26, 2017 14:15 UTC