Finding the Fourth Proportional to 22,456.32, 30,989.96 and 12,385.20

Step by Step Solution

1. Step 1: Write the proportion equation
   22,456.32 : 30,989.96 = 12,385.20 : x
2. Step 2: Convert to fraction form
   22,456.32/30,989.96 = 12,385.20/x
3. Step 3: Cross multiply
   22,456.32x = 30,989.96 × 12,385.20
4. Step 4: Simplify right side
   22,456.32x = 383,816,852.59
5. Step 5: Solve for x
   x = 383,816,852.59/22,456.32
6. Step 6: Final answer
   x = 17,091.71