Answer
Affluent, meaning having a great amount of wealth or money, aptly describes Yusupov's financial standing. His immense riches, derived from vast landholdings, industrial ventures, and mineral resources, placed him among the most prosperous individuals of his time. Yusupov's wealth allowed him to live an opulent lifestyle, characterized by luxurious palaces, extravagant parties, and a lavish patronage of the arts.