Four positive numbers, $$\(a, b, c\)$$, and $$\(d\)$$, have the property that $$\(\frac{a}{b}=\frac{b}{c}=\frac{c}{d}\)$$ and $$\(a> d\)$$ . If $$\(\frac{a-d}{b-c}> x\)$$ for all such $$\(a, b, c\)$$, and $$\(d\)$$, what is the maximum value of $$\(x\)$$ ?

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