Finding the Fourth Proportional to 22,499.47, 31,048.21 and 12,428.64

Step by Step Solution

1. Step 1: Write the proportion equation
   22,499.47 : 31,048.21 = 12,428.64 : x
2. Step 2: Convert to fraction form
   22,499.47/31,048.21 = 12,428.64/x
3. Step 3: Cross multiply
   22,499.47x = 31,048.21 × 12,428.64
4. Step 4: Simplify right side
   22,499.47x = 385,887,040.27
5. Step 5: Solve for x
   x = 385,887,040.27/22,499.47
6. Step 6: Final answer
   x = 17,150.94