By my guesses (well reasoned, but still guesses) The TOTAL software figures for Others should be like this:
Wii and PS3 = VGC*1.5
360 and DS = VGC*2.1
PSP = VGC*6
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However that obviously doesn't translate over into weekly sales because it's older games that are missing.
So really the multipliers for the last 7 weeks are probably something like this (applying to "Others" only though):
Wii, 360, PS3 and DS add only a few percent, say 5% max (VGC*1.05)
PSP could be ~40% low (VGC*1.4)
PS2 I have no idea, but could arguably be 100% low considering all those hundreds of different games that might have sold a few dozen copies.