Finding the Fourth Proportional to 22,311.35, 30,789.32 and 12,239.76

Step by Step Solution

1. Step 1: Write the proportion equation
   22,311.35 : 30,789.32 = 12,239.76 : x
2. Step 2: Convert to fraction form
   22,311.35/30,789.32 = 12,239.76/x
3. Step 3: Cross multiply
   22,311.35x = 30,789.32 × 12,239.76
4. Step 4: Simplify right side
   22,311.35x = 376,853,768.43
5. Step 5: Solve for x
   x = 376,853,768.43/22,311.35
6. Step 6: Final answer
   x = 16,890.68