Using the $2023$ Chicago Sector Radio navigation chart, updating the magnetic compass variation VAR to $2024$ :

An aircraft bound South$-$West at FL$390$ is guided by the Flight Management System with RNAV $4$D capability using $-$ navigation based on Peotone VOR$-$DME. VOR locator indicates QDR of $240,$ and DME distance is $21\mathrm{.}0$ NM$.$ Estimate the positioning accuracy $99,999\%$ of time, knowing the VOR accuracy of $+-1\mathrm{.}4$ and DME accuracy of $+-0\mathrm{.}2$ NM$?$