Which number is the greatest in the given list?

1. 67,05,432

2. 6,70,543

3. 76,05,432

4. 67,50,432

Comparing the numbers, the three 7-digit numbers are 67,05,432; 76,05,432 and 67,50,432, while 6,70,543 has only 6 digits. Among the 7-digit numbers, 76,05,432 is the greatest.

Hence, option 3 is the correct option.