If 128 is added in a number then result becomes 157\(\frac{1}{7}\) % of itself. Find the number.

224

157\(\frac{1}{7}\)% = 100         +         57\(\frac{1}{7}\)

                    ↓                       ↓      

            Original               amount added

      57\(\frac{1}{7}\)% = \(\frac{4}{7}\)  [4 is added, 7 is original]

                         4 → 128

                         7 → \(\frac{128}{4}\) = 224