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The proper way to do this comparison would be to divide Ripple's market cap with Bitcoin's supply. $122,412,211,193 / 16,783,037 = $7,294, not $18,953. He actually has the number right for Ethereum though.....

Why would you divide market cap by BTC Supply? To me that doesn’t make sense. But my method gets you the same answer. Yes his ripple calculation is off

Because you want to see how much XRP would be if it had the same number of coins as Bitcoin. Coin Price x Number of Coins = Market Cap. So Market Cap / Number of Coins = Coin Price. Your method get's the same answer but mine has one less variable, so I prefer mine.

When you multiply a ratio by a number (XRP Price), you are only multiplying the numerator of that ratio with the number.
(XRP Supply / BTC Supply) (XRP Price) >>> Yours
= [(XRP Supply) (XRP Price)] / BTC Supply
= (XRP Market Cap) / BTC Supply >>> Mine is yours simplified

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