A city doubles its size every 82 years. If the population is currently 139,000, what will the population be in 246 years?

To find the population in 246 years, we first need to determine how many times the city doubles in size over that period. We can do this by dividing the total number of years by the doubling period: 246 years / 82 years/doubling = <<246/82=3>>3 doublings.

Since the city doubles in size with each doubling period, we need to multiply the current population by 2 for each doubling. Starting with a population of 139,000, we can calculate the population after three doublings:

1st doubling: 139,000 * 2 = 278,000
2nd doubling: 278,000 * 2 = 556,000
3rd doubling: 556,000 * 2 = 1,112,000

Therefore, the population in 246 years will be 1,112,000.