Arithmetic on today's supply, not a forecast. It assumes nothing about whether Rain could attract that much money.
A coin's market capitalisation is its price multiplied by the number of coins in circulation. Rain has 709,750,884,694 RAIN in circulation at $0.006784 each, which is $4.81B. Holding that supply still and putting XRP's $82.1B in its place gives $0.11568024 per RAIN.
Rain would have to take on $77.29B of new money to get there. A 17.1x 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 RAIN at that level, which is the part that actually decides a price.
$0.11568024 per RAIN. That is XRP's current market capitalisation of $82.1B divided across the 709,750,884,694 RAIN in circulation.
17.1x. Rain trades at $0.006784 today and XRP's market cap is $82.1B against Rain's $4.81B.
No. It is one division: XRP's market capitalisation spread over the supply of RAIN that exists today. It assumes nothing about whether Rain 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 $82.1B of market cap spread over more coins gives a lower price per coin. This uses the 709,750,884,694 RAIN in circulation now.