... the third sentence ...Could you tell me whether the sentence 3 is correct or not?
It is. Why did you think it might not be?
First of all, you found some definition for "make it". But we have a case of "make it to smth".You don't even need to leave this site to find the definition. UE has an extensive list of Phrasal Verbs. Here's the link to our entry for "make it".
"Make it" is the basic phrase. It can be used in different ways.But we have a case of "make it to smth".
It's relevant. Becoming Managing Director is a result, or an achievement. It's also a figurative "arrival"--he arrived at that situation.This site gives:
1. Arrive.
2. To get a result.
This is irrelevant to our case.
Not really. It just happens that their choice of example is more similar to the phrase you asked about. Dictionaries have to choose their examples because they can't refer to every possible use.Oxford gives a much closer meaning:
They're variants of the same basic phrase, "make it". If you keep looking you'll find it in some dictionary. But you already have all the information you need.I would definitely like to have a look at "make it to" somewhere.