Arithmetic on today's supply, not a forecast. It assumes nothing about whether Cardano could attract that much money.
A coin's market capitalisation is its price multiplied by the number of coins in circulation. Cardano has 37,103,888,235 ADA in circulation at $0.1973 each, which is $7.32B. Holding that supply still and putting XRP's $82.38B in its place gives $2.2201 per ADA.
Cardano would have to take on $75.06B of new money to get there. A 11.3x 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 ADA at that level, which is the part that actually decides a price.
$2.2201 per ADA. That is XRP's current market capitalisation of $82.38B divided across the 37,103,888,235 ADA in circulation.
11.3x. Cardano trades at $0.1973 today and XRP's market cap is $82.38B against Cardano's $7.32B.
No. It is one division: XRP's market capitalisation spread over the supply of ADA that exists today. It assumes nothing about whether Cardano 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 $82.38B of market cap spread over more coins gives a lower price per coin. This uses the 37,103,888,235 ADA in circulation now.