Solve similar triangles can someone please answer please


Answer:
Step-by-step explanation:
ΔADE & ΔABC are similar triangles.
[tex]\frac{AD}{AB}=\frac{DE}{BC}\\\\\frac{12}{4}=\frac{12}{x}\\[/tex]
Cross multiply,
12*x = 12*4
[tex]x= \frac{12*4}{12}\\[/tex]
x = 4