Finding the Fourth Proportional to 16,688.72, 25,018.49 and 8,357.06

Step by Step Solution

1. Step 1: Write the proportion equation
   16,688.72 : 25,018.49 = 8,357.06 : x
2. Step 2: Convert to fraction form
   16,688.72/25,018.49 = 8,357.06/x
3. Step 3: Cross multiply
   16,688.72x = 25,018.49 × 8,357.06
4. Step 4: Simplify right side
   16,688.72x = 209,080,855.16
5. Step 5: Solve for x
   x = 209,080,855.16/16,688.72
6. Step 6: Final answer
   x = 12,528.28