Question 203297
You can set up the proportion as follows:
(7 PCs infected)/(12 PCs connected) = (x PCs infected)/(216 PCs connected) or...
{{{7/12 = x/216}}} Multiply both sides by 216.
{{{x = 7(216)/12}}} Evaluate.
{{{highlight(x = 126)}}} This is the estimated number of infected PCs.