Hi
Interesting: your file can reflow the 3 first pages but not the 4th!
Without loosing much time with the file I would say, try to read in landscape - press the zoom button until the screen rotates - and see if it's acceptable.
One thing you can make to try to get a bit more of information is to crop the white margin, I have made a new version of yours using Acrobat 8 and I’m uploading it here.
Best,
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