Finding the Third Proportional to 16,690 and 25,831.50

Step by Step Solution

1. Step 1: Write the proportion equation
   16,690 : 25,831.50 = 25,831.50 : x
2. Step 2: Convert to fraction form
   16,690/25,831.50 = 25,831.50/x
3. Step 3: Cross multiply
   16,690x = 25,831.50 × 25,831.50
4. Step 4: Simplify right side
   16,690x = 667,266,392.25
5. Step 5: Solve for x
   x = 667,266,392.25/16,690
6. Step 6: Final answer
   x = 39,980.01