Finding the Fourth Proportional to 21,030.78, 31,494.24 and 16,311.49

Step by Step Solution

1. Step 1: Write the proportion equation
   21,030.78 : 31,494.24 = 16,311.49 : x
2. Step 2: Convert to fraction form
   21,030.78/31,494.24 = 16,311.49/x
3. Step 3: Cross multiply
   21,030.78x = 31,494.24 × 16,311.49
4. Step 4: Simplify right side
   21,030.78x = 513,717,992.25
5. Step 5: Solve for x
   x = 513,717,992.25/21,030.78
6. Step 6: Final answer
   x = 24,426.96