Since your question is rather broad, it is difficult to answer with specifics. It would be helpful to know what the proposed aquisition is? Is it an ongoing business, a franchise, is it a public or privately held business? In general, the methods range from traditional financing to IPO's to GoFundMe to private or angel invertors. If the person inquiring can provide more specifics, we'll craft an answer and recommendations suited to the specifics.
Thanks for the opportunity to be of service!