I am trying to solve fig $4-33$ these are supposed to be the correct answers but i think i am not understaning the ratios they use in method of join can someone please show them to me$?$ I keep getting $5\mathrm{.}4$ not $4\mathrm{.}5$ on AC thank you.

$4\mathrm{.}29$ Using the mathematical method of joints, determine the force in each member of the truss in Fig. $4-33.$ Ans.,$A_x=6\mathrm{.}36$kips,$A_y=10$kips,$B_x=6\mathrm{.}36$kips,$AC=4\mathrm{.}5$kips.$T,AD=8\mathrm{.}4$kipsT,$CD=0,CB=4\mathrm{.}5$kipsT,$BD=7\mathrm{.}8$kipsC