The unknown term is 22.6
28.9
26.8
24.7
22.6
20.5
As you can see, the numbers after the decimal point descends by 1 point. 9 , 8 , 7 , 6 , 5
While the numbers before the decimal point descends by 2 points, 28 , 26 , 24 , 22 , 20
When u all those 5 numbers together u get 354 so:
354/5= 70.8
70.8 is ur median
It either x=5 or x=-2 not sure which on