Warren Buffett is the fifth-richest man in the world, according to the Forbes Real Time Billionaires Index, and one the most successful investors of this age. His company, Berkshire Hathaway Inc., reported a 40% rise in operating earnings in the third quarter. Berkshire Hathaway also reported a record $157.2 billion cash holding as of Sept. 30. The majority of Buffett's earnings came from his insurance business, with Geico reporting total underwriting earnings of over $1 billion in the last quar