Solution
Three numbers a,b,c are in proportion iff $$b^2 = ac$$
Here, a = 4 and b = 28
=> $$(28)^2 = 4 \times c$$
=> $$c = \frac{28 \times 28}{4} = 7 \times 28$$
=> $$c = 196$$
=> Ans - (D)
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