1. She was fortunate in that she had friends to help her.

2. She was fortunate for the reason that she had friends to help her.

3. She was fortunate because she had friends to help her.
------------------------------
Are they all the same in meaning?
What is the part of speech of 'that' in Sentence 1? Is 'that' a conjunction?

All are the same in meaning, but #3 is the best phrasing.

In #1, "that" is the introductory word for the noun clause "that she had friends to help her." The entire noun clause is serving as the object of the preposition "in."

Yes, all three sentences have the same meaning. They all indicate that the person mentioned was lucky because she had friends to assist her.

In sentence 1, the word 'that' is a subordinating conjunction. It introduces a clause that provides additional information about the reason why the person was fortunate.

1. She was fortunate in that she had friends to help her.

2. She was fortunate for the reason that she had friends to help her.
3. She was fortunate because she had friends to help her.

In terms of meaning, all three of these sentences convey the same message. They all express the idea that the person mentioned was lucky or fortunate because they had friends who were able to help them.

Regarding the part of speech of 'that' in Sentence 1, it is not a conjunction in this case. Instead, 'that' functions as a pronoun that introduces a subordinate clause, acting as the object of the preposition 'in.' The clause, "she had friends to help her," provides additional information about the situation mentioned in the main clause.