I answered this question and changed the title to "How can I replicate Vanguard's Total Stock Market Index using their S&P 500 and extended stock market funds?" because I felt that more accurately reflected the question. However, since questions that are too localized aren't good, I wondered if I should alter the title to something along the lines of "How do I replicate a mutual fund using other mutual funds?"
As it stands, I think the question is already general enough, and I tried to provide some general strategies for portfolio replication in my answer, but in the future, are specific titles about the issue in question preferred to general titles addressing the topic?
I'm assuming for the time being that the question is fine, i.e. specific enough not to be closed as too localized and general enough not to be closed as too vague.