Linear trend chart using baseline data

Thanks for the reply from lbendlin , please allow me to provide another insight: 

Hi  manojk_pbi ,

I created some data:

Here are the steps you can follow：

1. Create calculated table.

Table 2 =
var _date=
SUMMARIZE('Table','Table'[Month],"mindate",MINX(FILTER(ALL('Table'),'Table'[Month]=EARLIER('Table'[Month])),[Date]))
return
ADDCOLUMNS(
    _date,"rank",RANKX(_date,[mindate],,ASC))

2. Select [Month] – Column tools – Sort by column – [rank].

3. Create measure.

value =
var _index=MINX(ALL('Table 2'),'Table 2'[rank])
var _month=MINX(FILTER(ALL('Table 2'),'Table 2'[rank]=_index),[Month])
var _value=
SUMX(FILTER(ALL('Table'),'Table'[Month]=_month),[Tasks])
RETURN
IF(
    MAX('Table 2'[rank])= _index,_value,
    _value-
_value * (MAX('Table 2'[rank])-1) * 0.008)

4. Result:

Best Regards,

Liu Yang

If this post helps, then please consider Accept it as the solution to help the other members find it more quickly