Invented example
A token with 589 trillion in circulation at a $10 billion cap
An invented memecoin has 589 trillion tokens in circulation and trades at $0.0000123. A post says it will reach a $10 billion market cap.
10,000,000,000 ÷ 589,000,000,000,000 = $0.00001698 per token
The claim implies a price of about $0.00001698, a market cap 1.38 times today's. A claim that it reaches $1 would need a market cap of $589 trillion.
The arithmetic says nothing about whether buyers exist at that price. It only shows what the claim requires.