Conversation so far:
When did Irving Fisher come up with utility theory?
Irving Fisher's thesis was published by Yale in 1892
What are the features of Irving Fisher's utility theory?
Irving Fisher's utility theory contained the first careful examination of the measurability of the utility function and its relevance to demand theory“
Did Irving Fisher's utility theory get more reviews besides that of George Stigler?
Irving Fisher and others brought neoclassical theory into American journals, classrooms, and textbooks. Eventually, for better or worse, their paradigm would dominate economic science in this country.
Where was Irving Fisher when he came up with Utility Theory?
Irving Fisher was at Yale when he came up with Utility Theory
Are there any other interesting aspects about Irving Fisher's theories besides coming up with Utility theory at Yale?
Irving Fisher is probably best remembered today in neoclassical economics for his theory of capital, investment, and interest rates

Question: How did he do that?
Self-contained rewrite: How did Irving Fisher come up with his theory of capital, investment, and interest rates?