What would 3.5 billion dollars in 1900 be worth today?

To determine the value of $3.5 billion in 1900 in today's dollars, we need to consider inflation over the years. Adjusting for an average inflation rate of about 2.5% per year, $3.5 billion in 1900 would be equivalent to roughly $120 billion to $130 billion today. This estimate can vary based on the specific methods and indices used for calculating inflation.