I personally don't think using a population break point is a particularly useful format since comparing industrialized and non-industrialized nations has obvious limitations to me. But since you asked -,
Median wealth (in US $) per adult by population (in excess of 100,000,000)
China - 20,942
India - 3,042
United States - 65,904
Indonesia - 1,977
Pakistan - 1,766
Brazil - 5,031
Nigeria - 1,249
Bangladesh - 2,787
Russia - 3,683
Mexico - 9,944
Japan - 110,408
Ethiopia - 1,360
Philippines - 2,663
Egypt - 4,900
It would seem to me that the comparison that may be more telling is using more similarly situated industrialized nations. For convenience, I am using the top 15 countries on Credit Suisse's list of total wealth of a nation and including -
Median and Mean wealth (in US $) of adults in each
Switzerland - 227,891 - 564,653
Australia - 181,361 - 386,058
Japan - 110,408 - 238,104
Canada - 107,004 - 294,255
France - 101,942 - 276,121
United Kingdom - 97,452 - 280,049
Spain - 95,360 - 207,531
Italy - 91,889 - 234,139
South Korea - 72,198 - 175,015
Taiwan - 70,191 - 210,525
United States - 65,904 - 432,365
Germany - 35,313 - 216,654
Netherlands - 31,057 - 279,077
China - 20,942 - 58,544
India - 3,042 - 14,569
(Sorry about the way G&B site eats up formatting spaces)