PLEASE PLEASE HELP ME PLEASE!!!!

Answer:
The answer to the question provided is 24.
(I'm not sure if it's right, I struggled a little.)
Step-by-step explanation:
[tex] \frac{28}{16} = \frac{42}{x} \\ \\ \frac{672}{28} = \frac{28x}{28} \\ \\ 24 = x[/tex]
Happy to help anytimes!