Finding the Third Proportional to 16,121.53 and 20,434.78

Step by Step Solution

1. Step 1: Write the proportion equation
   16,121.53 : 20,434.78 = 20,434.78 : x
2. Step 2: Convert to fraction form
   16,121.53/20,434.78 = 20,434.78/x
3. Step 3: Cross multiply
   16,121.53x = 20,434.78 × 20,434.78
4. Step 4: Simplify right side
   16,121.53x = 417,580,284.74
5. Step 5: Solve for x
   x = 417,580,284.74/16,121.53
6. Step 6: Final answer
   x = 25,902.02