The adjective "benevolent" describes a person who is kind-hearted, generous, and willing to help others. Such a person shows goodwill through their words and actions.
\[ \text{Benevolent} = \text{Kind, generous, and compassionate} \]
In the given sentence, "The old man was benevolent with his fortune," the phrase indicates that he used his wealth generously to help others instead of keeping it only for himself.
Hence, the word "Kind" is the most appropriate meaning of "benevolent".
Explanation of the other options:
Therefore, the correct answer is: \[ \boxed{\text{Option 4 — Kind}} \]