To begin with, the results of each of the procedures will need to be inserted into their own tables.

CREATE TABLE #FirstOutput (ServerName SYSNAME, Edition NVARCHAR(256), [Level] NVARCHAR(26))

CREATE TABLE #SecondOutput (DatabaseName SYSNAME, Allocated_Size INT, FreeSize INT)

CREATE TABLE #ThirdOutput (DatabaseName SYSNAME, UserName NVARCHAR(256), [Role] NVARCHAR(26))

INSERT #FirstOutput

EXEC storedProc1

INSERT #SecondOutput

EXEC storedProc2

INSERT #ThirdOutput

EXEC storedProc3

From that point further, use these tables as the source of the final insert.