Find a continuous function f, where $(x_{4}−4x_{2})≤f(x)≤(2x_{2}−x_{3})$ such that the area bounded by $y=f(x),y=x_{4}−4x_{2},$ the y-axis, and the line $x=t,where(0≤t≤2)$ is k times the area bounded by $y=f(x),y=2x_{2}−x_{3},$ y-axis, and line $x=t(where0≤t≤2).$