Elon Musk gains $8 billion to become world's fourth-richest person

Co-founder's fortune has grown by $57.2 bn this year

Elon Musk’s financial upswing shows no signs of slowing. The outspoken entrepreneur is now the world’s fourth-richest person after Tesla shares surged 11 per cent on Monday, closing at a record high and boosting Musk’s net worth by $7.8 billion.
 

The rise vaulted the Tesla co-founder past French luxury tycoon Bernard Arnault, the wealthiest non-American on the Bloomberg Billionaires Index Musk’s $84.8 billion fortune puts him within $15 billion of Mark Zuckerberg, No. 3 on the ranking of the world’s 500 richest people.
 

Monday’s Tesla rally is just the latest triumph for the billionaire who only two years ago was