AB: This move is opposite to the XA move and it should be about 61.8% of the XA move.
BC: This price move should be opposite to the AB move and it should be 38.2% or 88.6% of the AB move.
CD: The last price move is opposite to BC and it should be 127.2% (extension) of BC move if BC is 38.2% of AB. If BC is 88.6% of AB, then CD should be 161.8% (extension) of BC.
AD: The overall price move between A and D should be 78.6% of XA