Ok. After reading your answer, it becomes obvious, the camel cannot eat all bananas before proceeding. The camel eats 1 banana at a time prior to each mile it travels.
So your solution did not provide me with a number. (and the number you will end up with is still not the highest number in any event).
Again, the question is if you start with 3,000 bananas, how many will you be able to get across the 1,000 mile journey?