Sum row with next row value and grab next value in other column for the date selected

Let's say I have this data:

         Earn     Earn Cum.
13-Apr       -        -   
14-Apr      48        48 
15-Apr     257       305 
16-Apr     518       823 
17-Apr     489     1,312 
18-Apr     837     2,149 
19-Apr   1,005     3,154 
20-Apr   1,021     4,175 
21-Apr   1,463     5,638 
22-Apr   2,630     8,268 
23-Apr   2,993    11,261 
24-Apr   3,354    14,615 
25-Apr   4,332    18,947 
26-Apr   4,885    23,832 
27-Apr   4,514    28,346 
28-Apr   4,356    32,702 
29-Apr   4,824    37,526 
30-Apr   7,082    44,608 
1-May    6,091    50,699 
2-May    1,407    52,106

When a date is selected in a dropdown slicer for example: 1-May I'd like to sum the rows 1-May with the next row 2-May for the column Earn and grab the next value 52,106 for the column Earn Cum.. The result should be:

1-May    7,498    52,106

Another example: if the date selected was 30-Apr the result must be:

30-Apr  13,173    50,699

I'm scratching my head trying to do this using a measure in Power BI.

Solution

I'll call your table "Data".

Create a measure:

Next Earn =
VAR Current_Date = MAX ( Data[Date] )
VAR Next_Date = Current_Date + 1
RETURN
    CALCULATE (
        SUM ( Data[Earn] ),
        Data[Date] = Current_Date || Data[Date] = Next_Date
    )

Create another measure:

Next Cum Earn = 
VAR Current_Date =  MAX ( Data[Date] )
VAR Next_Date = Current_Date + 1
RETURN
    CALCULATE ( SUM ( Data[Earn Cum] ), Data[Date] = Next_Date )

Result:

Note: the code assumes that your dates are sequential (no gaps). If they have gaps, things are a bit more complex.