For anyone but corporate executives (who are federally required to report the bulk of their wealth, for most, via SEC Form 10-K), yes. For someone like many CEO's, for instance, not really, because you can easily tabulate the majority of their compensation over the history of the position.
The major caveats being inherited wealth, privately sold businesses or other private investments. Further, it would be extremely difficult to compensate for private debts.
I used to create net worth balance sheets for the ultra-rich. They always have more money than you think.