RobH_en_tn/num/23/10.md

Who can count the dust of Jacob or number even only one-fourth of Israel?

Here "dust of Jacob" is a metaphor that speaks of the number of Israelites as if they were as numerous as the specks of dust. This rhetorical question can be translated as a statement. Alternate translation: "There are too many Israelites to count. No one could count even a fourth of them because there are so many." (See: rc://en/ta/man/translate/figs-rquestion and rc://en/ta/man/translate/figs-metaphor)

the death of a righteous person

It is understood that this will be a peaceful death. This can be stated. Alternate translation: "the peaceful death of a righteous person" (See: rc://en/ta/man/translate/figs-explicit)

a righteous person ... like his

These are metonymies that refer to the people of Israel as a single person. (See: rc://en/ta/man/translate/figs-metonymy)