Using the given figure, we can use the Basic Proportionality Theorem
[tex]\frac{2.8}{11.2}=\frac{3.4}{NZ}[/tex]Let's solve for NZ
[tex]\begin{gathered} 2.8\cdot NZ=3.4\cdot11.2 \\ NZ=\frac{3.4\cdot11.2}{2.8} \\ NZ=\frac{38.08}{2.8} \\ NZ=13.6 \end{gathered}[/tex]Once we have NZ length, we can find XZ using the sum of segments
[tex]XZ=XN+NZ=3.4+13.6=17[/tex]Hence, the length of XZ is 17 centimeters.