need help with math problem!!

Answer:
Step-by-step explanation:
[tex]\dfrac{y}{42.3}=\dfrac{144}{56.4}\qquad\text{cross multiply}\\\\56.4y=(42.3)(144)\\\\56.4y=6091.2\qquad\text{divide both sides by 56.4}\\\\\dfrac{56.4y}{56.4}=\dfrac{6091.2}{56.4}\\\\y=108[/tex]