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Box Diagonal Length

The equation $ x^3 - 4x^2 + 5x - \frac{19}{10} = 0 $ has real roots $ r, $ $ s, $ and $ t $. Find the length of the long diagonal of a box with sides of length $ r, $ $ s, $ and $ t $.

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$\frac{a}{b}$
.
0
=
%

$a^n$
$a^{\circ}$
$a_n$
$\sqrt{}$
$\sqrt[n]{}$
$\pi$
$\ln{}$
$\log$
$\theta$
$\sin{}$
$\cos{}$
$\tan{}$

$($
$)$
$[$
$]$
$\cap$
$\cup$
$,$
$\infty$