If (x + 1) ∶ (x + 5) ∶∶ (x + 17) (x + 53) then what is the mean proportional between (x + 5) and (9x – 1) where x > 0?

1
\(10\sqrt 2\)
2
\(3\sqrt 2\)
3
\(4\sqrt {13}\)
4
\(4\sqrt 3\)

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