Convert exponential number presented as string to a decimal
<p>Let's suppose I have a <strong>string</strong> that contains "7.2769482308e+01" (this number came from 3rd party software, I cannot control the format).</p>

<p>What is the cheapest way to convert it into decimal <code>72.769482308</code>?</p>

<p>The only solution I can think of is to split decimal + exponential part and use multiplication. But may be there some built it function to do the same?</p>

<p><strong>NOTE</strong>: Guys, yes, I've read <a href="http://stackoverflow.com/questions/4964059/convert-exponential-to-a-whole-number-in-php">Convert exponential to a whole number in PHP</a> and <a href="http://stackoverflow.com/questions/4461444/convert-exponential-number-to-decimal-in-php">Convert exponential number to decimal in php</a>. And that questions are irrelevant, since they already have a number, but I have a <strong>string</strong>.</p>
