The total weight, Wt $,$ is $21\mathrm{.}7$ lb $.$ The water content is $5\%,$ and the specific gravity of the soil, spg or Gs$,$ is $2\mathrm{.}68.$ All this mass is inside a container of $7"x7"x7".$ What is the weight of additional water $($lb$)$ to obtain $100\%$ of saturation?

Water density, ${}_w=62\mathrm{.}4$ pcf

Note: Provide the answer in this format #$.$## $(2$ decimal places$)$

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