Please help on number 3, multiple choice

Answer:
B
Step-by-step explanation:
We can solve by cross multiplying
5/6=4/x
5*x=6*4
5x=24
Divide both sides by 5. This will cancel the 5 on the left, and leave the x by itself.
5x/5=24/5
x=4.8
4.8 is the answer, therefore B is correct