What's the meaning of "with jackpots hitting hundreds of millions of dollars"?
"with jackpots hitting hundreds of millions of dollars, many lottery winners suddenly find themselves when much more money than they're used to"

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"With jackpots hitting hundreds of millions of dollars" <--- Because people can win $2,000,000 or more from the lottery, 
"many lottery winners suddenly find themselves with much more money than they're used to"

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"with jackpots hitting hundreds of millions of dollars..." is the same as saying "because/since jackpots are hitting hundreds of millions of dollars ..."

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"with jackpots hitting hundreds of millions of dollars"
=
'since prizes are as big as hundreds of millions of dollars"

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when --> with

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