In grid puzzles, totals often combine a square term} with a product term}. Try decomposing the target into recognizable chunks (e.g., \(a^2+b\times c\)) and solve for the unknown.
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):
\[\n102 = 8^2 + (6\times 4) + x\n\]
\(⇒\ 102 = 64 + 24 + x \ ⇒\ x=102-88=14.\)
\[\n\boxed{x=14}\n\]