DAX text calculation

[robarivas]

Can anyone help me figure out the DAX formula to get the last column of this table (C Desc) ?

Account	T #	T Date	C Date	T Desc =Related(relationship between this table's T# field and T# Description table)	C Desc
1	3777	1/1/2017	3/5/2017	Charge	Adj
1	7016	3/5/2017	3/5/2017	Adj	Adj
1	5716	6/9/2017	3/5/2017	Cash	Adj
2	8628	3/12/2017	9/2/2017	Charge	Cash
2	2855	9/2/2017	9/2/2017	Cash	Cash
2	9561	10/16/2017	9/2/2017	Adj	Cash
2	7026	11/22/2017	9/2/2017	WO	Cash

[MathFour]

If you were to do it yourself, what would you do? 

i.e. I totally don't understand how your last column has any logical relation to the rest. If you explain that a little more, we might be able to help.