Finding the Fourth Proportional to 22,456.70, 30,991.02 and 12,385.45

Step by Step Solution

1. Step 1: Write the proportion equation
   22,456.70 : 30,991.02 = 12,385.45 : x
2. Step 2: Convert to fraction form
   22,456.70/30,991.02 = 12,385.45/x
3. Step 3: Cross multiply
   22,456.70x = 30,991.02 × 12,385.45
4. Step 4: Simplify right side
   22,456.70x = 383,837,666.73
5. Step 5: Solve for x
   x = 383,837,666.73/22,456.70
6. Step 6: Final answer
   x = 17,092.35