first second and fourth of a proportion are respectively 5.2, 3.2 and 3 find its third term

Dear Student,

 For every proportion, the product of the extremes is always equal to the product of the means, i.e., a : b : : c : d if and only if ad = bc.
Then, 

5.2 : 3.2 :: x : 3So, 5.2×3 = 3.2×xx = 5.2×33.2x = 4.875Hence, the third term is 4.875

Regards

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