Finding the Third Proportional to 12,399.75 and 20,800.13

Step by Step Solution

1. Step 1: Write the proportion equation
   12,399.75 : 20,800.13 = 20,800.13 : x
2. Step 2: Convert to fraction form
   12,399.75/20,800.13 = 20,800.13/x
3. Step 3: Cross multiply
   12,399.75x = 20,800.13 × 20,800.13
4. Step 4: Simplify right side
   12,399.75x = 432,645,200.02
5. Step 5: Solve for x
   x = 432,645,200.02/12,399.75
6. Step 6: Final answer
   x = 34,891.45