Source: The Great Interpretation of Dreams (Ibn Sirin)
Seeing a deceased rich person in a dream indicates the poverty of his family after him or his need for prayers.
Source: Perfuming Humanity in the Expression of Dreams (Al-Nabulsi)
Seeing a deceased rich person alive indicates the return of wealth or sustenance.
Source: Signs in the Science of Expressions (Ibn Shaheen)
Seeing a deceased rich person is interpreted as his need for charity.