Finding the Third Proportional to 12,429 and 16,447.50

Step by Step Solution

1. Step 1: Write the proportion equation
   12,429 : 16,447.50 = 16,447.50 : x
2. Step 2: Convert to fraction form
   12,429/16,447.50 = 16,447.50/x
3. Step 3: Cross multiply
   12,429x = 16,447.50 × 16,447.50
4. Step 4: Simplify right side
   12,429x = 270,520,256.25
5. Step 5: Solve for x
   x = 270,520,256.25/12,429
6. Step 6: Final answer
   x = 21,765.25