“the proposed investment was economically viable”

Synonyms: workable, feasible, practicable, practical, applicable, usable, manageable, operable, operational, possible, within the bounds/realms of possibility, within reach, within reason, likely, achievable, attainable, accomplishable, realisable, reasonable, sensible, realistic, logical, useful, of use, serviceable, suitable, expedient, effective, valid, tenable