Finding the Fourth Proportional to 22,456.05, 30,989.57 and 12,384.90

Step by Step Solution

1. Step 1: Write the proportion equation
   22,456.05 : 30,989.57 = 12,384.90 : x
2. Step 2: Convert to fraction form
   22,456.05/30,989.57 = 12,384.90/x
3. Step 3: Cross multiply
   22,456.05x = 30,989.57 × 12,384.90
4. Step 4: Simplify right side
   22,456.05x = 383,802,725.49
5. Step 5: Solve for x
   x = 383,802,725.49/22,456.05
6. Step 6: Final answer
   x = 17,091.28