Finding the Fourth Proportional to 16,456.65, 24,629.69 and 13,688.88

Step by Step Solution

1. Step 1: Write the proportion equation
   16,456.65 : 24,629.69 = 13,688.88 : x
2. Step 2: Convert to fraction form
   16,456.65/24,629.69 = 13,688.88/x
3. Step 3: Cross multiply
   16,456.65x = 24,629.69 × 13,688.88
4. Step 4: Simplify right side
   16,456.65x = 337,152,802.40
5. Step 5: Solve for x
   x = 337,152,802.40/16,456.65
6. Step 6: Final answer
   x = 20,487.33