How to depicked a rgd from the values I have?

<mode>rgb</mode>
<c1>0.661945</c1>
<c2>0.796326</c2>
<c3>0.825</c3>
<c4>0.0</c4>

how would I make a color from the listed values? and what likely are they, I know this is not a rgb unlike how the head tag says it is.