Roll Down  -  Three Coin Splits
Once you can do all of the Two Coin Split variations you can add a third coin. There are two variations you should learn.

Middle + Index Split
Start Hold a stack of three coins edgewise between the thumb and middle fingers.
Directions
  1. Perform a Middle Split so that you finish with two coins between the middle and index fingers and one coin between the middle and ring fingers
  2. Perform a Index Split with the two coin stack.
  3. At this point you have a coin between the ring and middle fingers, a coin between the middle and index fingers and a coin between the thumb and index fingers.
  4. Reverse the moves to get back to the original position.

Middle + Ring Split
Start Hold a stack of three coins edgewise between the thumb and the middle  finger.
Directions
  1. Perform a Middle Split so that you finish with one coin between the middle and index fingers and two coins between the middle and ring fingers.
  2. Perform a Ring Split with the two coin stack.
  3. At this point you have a coin between the middle and index fingers, a coin between the middle and ring fingers and a coin between the ring and pinke fingers.
  4. Reverse the moves to get back to the original position.