First inversion means 3rd on the bottom. But that would mean the 9th was on top (7th above the bass note), which is not right. The significant aspect of the voicing is that the 9th goes below the 3rd (whole or half-step, depending on whether the chord is major or minor). I'm not sure if it matters where the root and 5th go, but I would think the usual place for the root is on the bottom. The 5th could go above or below the 9-3 interval.