(1) sounds OK to me, but I wouldn't say it means exactly the same as (2). To me the meaning seems more like "I found that there were people there to meet me". (3) sounds slightly odd to me, or unexpected at least.
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navitasana) He talked to people to help him. b) He amused people to welcome him.These don't sound right. In (a), the second "to" sounds as if it's supposed to mean "in order to" (which is obviously different from your original examples), but even with this interpretation the sentence does not work properly. I don't see any sensible interpretation for (b).
navitasanA) I found people (who were) there to meet me.In this one, "to" apparently means "in order to". When I initially looked at "I found people there to meet me", I didn't see "to" as meaning "in order to". I'm wondering now whether actually there are two ways of interpreting "I found people there to meet me". In the first, "to meet me" explains their pur