what place did you have in the line?

Leider gibt es m.W. kein allgemeines Konstrukt dafuer.Umschreibungen sind vonnoeten:

what was your position in line?
how many owners did this car have?
what number president was reagan?

Der wievielte Präsident der USA war Reagan?
A (somewhat colloquial) way of asking this in English would be:
What number president was Reagan?

I had second thought about this suggested translation. I think I would go for a slightly less terse translation:
"Of the Presidents of the United States, what number was Richard Nixon?"

In australia we just say;
Which president was reagen?
And this way we dont have to say the longer version of;
Which number president was reagen?

Aber eig gibs kein richtig ubersetzung fur wievielte. da gibs sau viele deutsche wurte die du englich nicht sagen kann.

ich hoffe meine deutscht war nicht zu schlecht xD

Als wievielter warst Du an der Reihe? - How many were ahead of you?

Der wievielte Besitzer des Autos bist Du? _ How many have owned the car before you?

Der wievielte Präsident der USA war Reagan? - How many presidents were there before Reagen?

e.g., if you're looking for some type of conformity.