Mukesh Ambani 18th richest man in the world

Indian business magnate Mukesh Ambani is the 18th richest person in the world with a personal wealth of $24.7 billion (Rs 134,244 crore) in 2012, according to the Bloomberg Billionaires Index, a daily ranking of the world's 100 wealthiest individuals.

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Mexican telecommunications magnate Carlos Slim remained the world's richest person last year holding a personal fortune of more than $70 billion (Rs 380,450 crore), it said.

Ambani, 55, chairman and MD of Reliance Industries, has also retained his position as the world's richest Indian for the sixth year in a row and increased his ranking from 19th to 18th position and personal wealth from $21 billion (Rs 114,135 crore) to $24.7 billion in the world, the Index showed.

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The world's top 100 billionaires got even richer in 2012, with their total wealth rising by around 15 per cent to $1.81 trillion (Rs 98,37,350 crore), it said.

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 (Rs 326,100 crore), respectively.

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Renowned investor Warren Buffett slipped to fourth place, but added around $5 billion (Rs 27,175 crore) to his fortune over the year despite donating a substantial amount to charity last year.

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IKEA founder Ingvar Kamprad saw his net worth rising 16.6 per cent to approximately $40 billion, putting him in fifth place on Bloomberg's billionaire index.