Calculating the transresistance in a multistage voltage-shunt(shunt-shunt) feedback amplifier
My answer does not answer trans-resistance, rather closed loop gain of a negative feedback amp with Norton Equivalent feedback.

Feedback ratio=R2/(R3//R5)~12.3 = -gain

Input impedance is reduced as a consequence of negative feedback. The Rbe is reduced the excess gain removed by feedback which becomes essentially much smaller than the series input R5.

So your Vo/Is=-Av*R5