In the multiplication sentence \( 228.6 \cdot 0 = x \), we can use the property of multiplication that states any number multiplied by zero is zero. Therefore, we have:
\[ 228.6 \cdot 0 = 0 \]
So, \( x = 0 \).
Thus, the value of \( x \) that makes the multiplication sentence true is:
\[ \boxed{0} \]