Not sure which number you're questioning, but it all looks right to me:

$852.7B[0] + $109.9B[0] = $962.6B ~= $1T ($1,000,000,000,000)

World population ~= 8.3B (8,300,000,000)[1]

$1,000,000,000,000 / 8,300,000,000 people = $120.481927711 per person[2]

[0] https://www.forbes.com/real-time-billionaires/

[1] https://www.worldometers.info/world-population/

[2] https://www.google.com/search?q=%241%2C000%2C000%2C000%2C000...