In the following figure current I equal to

According to Kirchhoff's Current Law (KCL), the total current entering a closed boundary or network must be equal to the total current leaving it.

Sum of all currents entering the network:
$I_{\text{in}} = 2.7 + 3 + 4.5 + 2.3 = 12.5\ \text{A}$

Sum of all currents leaving the network:
$I_{\text{out}} = 2.4 + 3.7 + 3.1 + I = 9.2 + I$

Equating the entering and leaving currents:
$12.5 = 9.2 + I$

$I = 12.5 - 9.2 = 3.3\ \text{A}$

Answer: $3.3\ \text{A}$