Finding the Fourth Proportional to 20,499.49, 28,292.46 and 12,434.47

Step by Step Solution

1. Step 1: Write the proportion equation
   20,499.49 : 28,292.46 = 12,434.47 : x
2. Step 2: Convert to fraction form
   20,499.49/28,292.46 = 12,434.47/x
3. Step 3: Cross multiply
   20,499.49x = 28,292.46 × 12,434.47
4. Step 4: Simplify right side
   20,499.49x = 351,801,745.10
5. Step 5: Solve for x
   x = 351,801,745.10/20,499.49
6. Step 6: Final answer
   x = 17,161.49