Unfortunately, there are two quite different meanings for billion. You write a 1, then you add either 9 or 12 zeroes, depending on the country. English-speaking countries normally use a 1 with 9 zeroes.
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In the US, 1 billion is 1 x 109 so 323.3 billion is 323,300,000,000.
In number form: 4,600,000,000,000 *US short scale, 1 trillion = 1 million millionIn word form: four trillion, six hundred billion.
1 x 109
One billion is 1,000,000,000, or 1 followed by 9 zeroes. So, 288.7 billion is 288,700,000,000 in numerical form.
Fill out digits to the right of the decimal point, until you have 9 digits after the point. After the "1", just add zeroes. Then take the point away. In some countries, a billion is a 1 with 12 zeroes, instead of 9, so check the definition of "billion" in your country. However, a 1 with 9 zeroes is the more commonly-used definition.