China has surpassed Britain to become the fourth-largest economy in the world, according to a World Bank report. The report pegged China's economic output at US$2.26 trillion, US$94 million or 0.004% more than Britain's. Although China overtook Britain last year based on gross domestic product converted in US dollars, the World Bank makes the conversion based on a three-year average, which smooths out currency fluctuations. The US, Japan and Germany maintain first, second and third places. The World Bank posted the ratings on its website over the weekend. Still, economists said there is a huge gap between China and Britain's economy in terms of quality.