Final answer:
Lieutenant Dan invested Forrest Gump's money in Apple Computer, which becomes a supportive element of the story's theme of success due to good fortune and innocence.
Step-by-step explanation:
Lieutenant Dan invested Forrest Gump's money into a new technology firm known as Apple Computer. In the movie Forrest Gump, this investment is portrayed as a pivotal moment that results in the financial success of the titular character and his shrimp business, Bubba-Gump Shrimp Company. The film humorously describes this investment as 'some kind of fruit company,' underscoring Forrest's innocence and naivety towards the stock market and technology investments.