3/8 * 2 2/7 * 4 2/3;

1. Convert mixed numbers to improper fractions: 2 2/7 = 16/7, 4 2/3 = 14/3.
2. Multiply the fractions: (3/8) * (16/7) * (14/3).
3. Simplify: (3*16*14) / (8*7*3) = (1*2*2) / (1*1*1) = 4.