@TWRoO
1.55M - 1.19M = 360K
So all we can say with certainty is that it sold (probably well) over 360K in Q4. It's mathematically possible (although unlikely) that 360 could have outsold the Wii during December following Wii's "takeover", so it's not possible to calculate a minimum that Wii outsold Xbox 360 in Q4.