Do you remember the word お金? This is the 金 in this word. The reading for 持ち is the も you learned with 持つ. So, combine the かね of お金 and the 持ち and you have the reading of this word. Alternatively, you can say this word as お金持ち as well.
He’s rich though…
I want to marry someone who is filthy rich.
I used to run small errands for a wealthy neighbor of mine to make money when I was young.