Arithmetic on today's supply, not a forecast. It assumes nothing about whether Sky could attract that much money.
A coin's market capitalisation is its price multiplied by the number of coins in circulation. Sky has 23,505,710,333 SKY in circulation at $0.06386 each, which is $1.5B. Holding that supply still and putting Zcash's $21.05B in its place gives $0.89534251 per SKY.
Sky would have to take on $19.54B of new money to get there. A 14.0x move is large: it happens, and it usually needs the whole market to grow instead of one coin to take share from another.
Supply is held still, and in practice it moves: coins are minted, burned and unlocked, and every one of those changes the price a given market capitalisation implies. The figure also says nothing about whether the money exists to buy SKY at that level, which is the part that actually decides a price.
$0.89534251 per SKY. That is Zcash's current market capitalisation of $21.05B divided across the 23,505,710,333 SKY in circulation.
14.0x. Sky trades at $0.06386 today and Zcash's market cap is $21.05B against Sky's $1.5B.
No. It is one division: Zcash's market capitalisation spread over the supply of SKY that exists today. It assumes nothing about whether Sky could attract that much money, and it holds the supply still when in practice supply changes.
It sets it. Market cap is price times circulating supply, so the same $21.05B of market cap spread over more coins gives a lower price per coin. This uses the 23,505,710,333 SKY in circulation now.