Finding the Fourth Proportional to 3,978.77, 5,493.24 and 2,721.92

Step by Step Solution

1. Step 1: Write the proportion equation
   3,978.77 : 5,493.24 = 2,721.92 : x
2. Step 2: Convert to fraction form
   3,978.77/5,493.24 = 2,721.92/x
3. Step 3: Cross multiply
   3,978.77x = 5,493.24 × 2,721.92
4. Step 4: Simplify right side
   3,978.77x = 14,952,146.21
5. Step 5: Solve for x
   x = 14,952,146.21/3,978.77
6. Step 6: Final answer
   x = 3,757.98