You have regained consciousness ; this is most fortunate. (most fortunate = superlative adjective) If you use the definite article, you need a noun: This is the most fortunate thing (noun) that could have happened.
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WillPitt.....You have regained consciousness; this is most fortunate. Is "most fortunate"is itcorrect? yes "most fortunate" means (very)(extremely) fortunate.
Why not the most fortunate? Because you are not comparing it to another fortunate thing.