The purchasing power of $3.05 in 1914 would require $100 in today's time. A bag of "stuff" worth $100 today could have been purchased for $3.05 in 1914.

Technically, it does mean that $3.05 from 1914 is worth $100 today, but that's not a useful way of thinking about this. I.e., if your great-grandfather put $3.05 in an envelope in 1914 and you opened it today, it's still $3.05 worth of money (ignoring wheat pennies being a collectors items and whatnot).