Last out of inning

[Alameda]

POE - 1

J. Force Out. If an appeal is honored at a base to which a runner was forced to advance and the out is a forced out, no runs would score if it was the third out. If a forced runner, after touching the next base, retreats for any reason towards the base he had first occupied, the force play is reinstated and he may again be put out if the defense tags the base to which he is forced. If the batte-runner is put out or is the first out on multiple outs on the same play, this would eliminate all force outs. On an appeal play, the force out is determined when the appeal is make, not when the infraction occurred.

M. Fourth Out Appeal. An appeal may be made after the third out as long as it is made properly. (e.g., One out with runner on first and third. The batter hits a fly ball that is caught. Each runner leaves his base before the caught ball is touched. An appeal is made at first base for the third out. THe defensive team then makes an appeal at third base before the infielders leave the infield. The runner on third would then be declared out also, and the run would not count.
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I'm sorry I just don't see where this situation is addressed in those references. I'm not trying to be hard headed, I just want to understand this so I can get it right.

Please elaborate.

Thanks Jel and co.