\(\dfrac{1}{2011}.x=\left(1-\dfrac{1}{2}\right)\left(1-\dfrac{1}{3}\right)\left(1-\dfrac{1}{4}\right)\)
\(\dfrac{1}{2011}.x=\dfrac{1}{2}.\dfrac{2}{3}.\dfrac{3}{4}\)
\(\dfrac{1}{2011}.x=\dfrac{1}{4}\)
=> \(x=\dfrac{1}{4}:\dfrac{1}{2011}\)
=> \(x=\dfrac{2011}{4}\)