\[\sqrt{2 + \sqrt{2 + \sqrt{x}}} = 2\]
\[2 + \sqrt{2 + \sqrt{x}} = 4\]
\[\sqrt{2 + \sqrt{x}} = 2\]
\[2 + \sqrt{x} = 4\ \ \]
\[\sqrt{x} = 2\ \ \]
\[x = 4.\]