已知
\(F\)\({\,\!}_{1}\)、
\(F\)\({\,\!}_{2}\)为椭圆
\(E\)的左、右焦点,点
\(P\)\(\left(\begin{matrix} \begin{matrix}1, \dfrac{3}{2} \end{matrix}\end{matrix}\right)\)为其上一点,且有\(|\)
\(PF\)\({\,\!}_{1}|+|\)
\(PF\)\({\,\!}_{2}|=4\).
\((1)\)求椭圆\(C\)的标准方程;
\((2)\)过\(F\)\({\,\!}_{1}\)的直线\(l\)\({\,\!}_{1}\)与椭圆\(E\)交于\(A\)、\(B\)两点,过\(F\)\({\,\!}_{2}\)与\(l\)\({\,\!}_{1}\)平行的直线\(l\)\({\,\!}_{2}\)与椭圆\(E\)交于\(C\)、\(D\)两点,求四边形\(ABCD\)的面积\(S\)\({\,\!}_{四边形}\)\({\,\!}_{ABCD}\)的最大值.