Question 23904
This is a proportion problem. The distances compared are
the distance between the eyes( say dist1) and the distance from the eye to the outstretched fingers (say dist2).
if the distance between the eyes is 1 inch then the distance from the eye to the outstretched fingers is 10 inches. 

( here use some common sense, the bigger distance is 10; and that is the bigger distance between dist1 and dist2.. i think for most of us humans dist2 is definitely bigger than dist1)

Now we have

dist1 = 1 inch, then dist2 = 10 inches

what is dist2 if dist1 = 2.3"

Simple proportion

{{{dist2/10}}} = {{{2.3/1}}}

Solve for dist2 

dist2 = 23 inches.