Captain Smoker,
I noticed something odd about your X360 total.
When I input the monthly figure into spreadsheet, the YTD 2008 total I got is 1,417,000 , which is different than yours (1.556.000).
I think you are using the Week 1 - 42 as your total figure, while the monthly figure should use week 1 - 40 as total (since Jan to Sep only have 40 weeks, with Jan, March, June and September 08 having 5 weeks). Week 1 - 40 total is 1,417,000, while week 1 - 42 is 1,556,000. Since you are using Week 1 - 40 total for Wii and PS3 total, I think you should be consistent and also use Week 1 - 40 in your X360 total.
It is a pity that even with the significant price cut, X360 still didn't manage to cross streams in Europe. This doesn't bode well for X360 NPD Oct # (assuming Europe and US have similar result, which might not be the case).