Finding the Fourth Proportional to 22,310.45, 30,789.27 and 12,239.31

Step by Step Solution

1. Step 1: Write the proportion equation
   22,310.45 : 30,789.27 = 12,239.31 : x
2. Step 2: Convert to fraction form
   22,310.45/30,789.27 = 12,239.31/x
3. Step 3: Cross multiply
   22,310.45x = 30,789.27 × 12,239.31
4. Step 4: Simplify right side
   22,310.45x = 376,839,420.20
5. Step 5: Solve for x
   x = 376,839,420.20/22,310.45
6. Step 6: Final answer
   x = 16,890.71