Assume they are four independent beta random variables $X_i$, with means $mu_i$.
Note that the density functions would depend on the observed samples.
We could then test the hypothesis that $mu_1mu_2>mu_3mu_4$ by setting up a quadruple integral of the joint density function over the set
${ (x_1,x_2,x_3,x_4)mid x_1x_2>x_3x_4 }$.
If this integral is small, we reject the hypothesis $mu_1mu_2>mu_3mu_4$.
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