document.write( "Question 163277: the average of four numbers is 638.4 the first four numbers are 216 159.8 and 301.25 Find the fourth number. \n" ); document.write( "
Algebra.Com's Answer #120298 by edjones(8007)\"\" \"About 
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216+159.8+301.25+x=638.4*4
\n" ); document.write( "677.05+x=2553.6
\n" ); document.write( "x=2553.6-677.05
\n" ); document.write( "x=1876.55
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