Finding the Fourth Proportional to 16,428.72, 24,647.66 and 13,789.98

Step by Step Solution

1. Step 1: Write the proportion equation
   16,428.72 : 24,647.66 = 13,789.98 : x
2. Step 2: Convert to fraction form
   16,428.72/24,647.66 = 13,789.98/x
3. Step 3: Cross multiply
   16,428.72x = 24,647.66 × 13,789.98
4. Step 4: Simplify right side
   16,428.72x = 339,890,721.21
5. Step 5: Solve for x
   x = 339,890,721.21/16,428.72
6. Step 6: Final answer
   x = 20,688.81