1 1/3 * 3/7 + 1 13/15 : 2 4/9 - 11/12

Convert mixed numbers to improper fractions: (4/3 * 3/7) + (28/15 : 46/9) - 11/12.

Perform multiplication and division: 4/7 + (28/15 * 9/46) - 11/12 = 4/7 + 42/115 - 11/12.

Find a common denominator and perform addition/subtraction: 1932/1380 + 504/1380 - 1265/1380 = 1171/1380.