Finding the Fourth Proportional to 16,689.72, 25,019.98 and 8,358.06

Step by Step Solution

1. Step 1: Write the proportion equation
   16,689.72 : 25,019.98 = 8,358.06 : x
2. Step 2: Convert to fraction form
   16,689.72/25,019.98 = 8,358.06/x
3. Step 3: Cross multiply
   16,689.72x = 25,019.98 × 8,358.06
4. Step 4: Simplify right side
   16,689.72x = 209,118,494.04
5. Step 5: Solve for x
   x = 209,118,494.04/16,689.72
6. Step 6: Final answer
   x = 12,529.78