The U.S. dollar experienced an average inflation rate of 1.86% per year between 1867 and 2015. $7,200,000 in the year 1867 is worth $110,170,718.80 in 2015.
The inflation rate in 2015 was 0.12%.
Source: The Bureau of Labor Statistics' annual Consumer Price Index (CPI), established in 1913. Inflation data from 1665 to 1912 is sourced from a historical study conducted by political science professor Robert Sahr at Oregon State University.