Observation: The number \(102\) in the right block is derived from the numbers below it: \(8\) (left in the middle row), and \(6\) and \(4\) (bottom row), along with the missing value \(x\) in the middle row.
Rule (consistent):
\[102 \;=\; 8^2 \;+\; (6\times 4) \;+\; x\]
\(\Rightarrow\ 102 \;=\; 64 \;+\; 24 \;+\; x \ \Rightarrow\ x=102-88=14.\)
\[\boxed{x=14}\]