Finding the Third Proportional to 16,200 and 20,700.50

Step by Step Solution

1. Step 1: Write the proportion equation
   16,200 : 20,700.50 = 20,700.50 : x
2. Step 2: Convert to fraction form
   16,200/20,700.50 = 20,700.50/x
3. Step 3: Cross multiply
   16,200x = 20,700.50 × 20,700.50
4. Step 4: Simplify right side
   16,200x = 428,510,700.25
5. Step 5: Solve for x
   x = 428,510,700.25/16,200
6. Step 6: Final answer
   x = 26,451.28