We know that Jones family is driving from San Antonio to Anchorage, and that the distance between these two places is 4,304 miles.
Distance already covered by the family = 1,639.271 miles
Distance left to be covered = Total distance - Distance already covered
⇒ Distance left to be covered = 4,304 - 1,639.271
⇒ Distance left to be covered = 2,664.729 miles
Hence, the family needs to drive 2,664.729 miles further to reach Anchorage.
