The cloud software giant still hasn't joined the four-comma club ... yet.Salesforce (CRM -1.15%) is one of the world's largest cloud software companies, but it's still much smaller (as measured by market cap) than Amazon, Microsoft, and Alphabet  -- which all saw their market caps cross the trillion-dollar mark in recent years. Valued at $280 billion, Salesforce would still need to nearly quadruple its market cap to join the four-comma club.That might sound like a lofty goal, but Salesforce was only worth$ ...