The weight of the fish caught are
[tex]5.78lb,10.5lb,8.63lb[/tex]We are given that
[tex]1lb=454g[/tex]But
[tex]454g=0.454\operatorname{kg}[/tex]Hence
[tex]1\text{ lb}=0.454\operatorname{kg}[/tex]Therefore
[tex]\begin{gathered} 5.78\text{ lb}=5.78\times0.454\operatorname{kg}=2.62412\operatorname{kg} \\ 10.5\text{ lb}=10.5\times0.454\operatorname{kg}=4.767\operatorname{kg} \\ 8.63\text{ lb}=8.63\times0.454\operatorname{kg}=3.91802\operatorname{kg} \end{gathered}[/tex]Hence, the total weigh in kg will be
[tex]2.62412kg+4.767\operatorname{kg}+3.91802\operatorname{kg}=11.30914\operatorname{kg}[/tex]Therefore, the total weight of all fish that Rica caught, in kg is 11.30914kg