The final position is reached by shifting up three frets from fourth position, or down two frets from first position. The upside-down "L" from fourth position is on the left, and the "b" from first position is on the right.
Like second position, this one requires you to shift your hand for part of it. This time, the first string's notes require you to shift back one fret. The notes on the second string can be played either way.
The root can be found under your third finger on the fourth string, or under your first finger on the first string after you've shifted back a fret.