Finding the Fourth Proportional to 22,478.49, 31,018.11 and 12,406.28

Step by Step Solution

1. Step 1: Write the proportion equation
   22,478.49 : 31,018.11 = 12,406.28 : x
2. Step 2: Convert to fraction form
   22,478.49/31,018.11 = 12,406.28/x
3. Step 3: Cross multiply
   22,478.49x = 31,018.11 × 12,406.28
4. Step 4: Simplify right side
   22,478.49x = 384,819,470.17
5. Step 5: Solve for x
   x = 384,819,470.17/22,478.49
6. Step 6: Final answer
   x = 17,119.45