Math in OP is wrong, that's not how multiplication works in D&D.
There's a nice build in the linked thread, however it can easily be improved.
Kalashtar Psywar 14/Stoneblessed 3/Cragtop Archer 3
Feats: Ovechannel, Practiced Manifester, whatever prerequisites you need
18 powerlinks
projectile weapon of your choice, such as composite dragonbone greatbow of distance(150ft base range increment).
Extend range augmented for 56 pp, far shot, weapon of distance - range increment becomes base*16.5. Add umd and few scrolls and we've got base*19
Hmm. I don't like 19. Well, since tranparency is default, grab items for +2 CL, add 2 more powerlinks and we've got 4 more point of augmentation on extend range.
Range increment - base *20
Max shooting distance - base*20*15=base*300
Want to see how much that is? 45000ft. Add in 3.0 rules from SS and flight arrows from magazines and we've got 128k ft.
Or just use any of the tricks for epic feat qualification and grab
http://www.d20srd.org/srd/epic/feats.htm#distantShot - shoot at distant galaxies with no penalties.