Finding the Fourth Proportional to 22,458.69, 30,991.52 and 12,387.20

Step by Step Solution

1. Step 1: Write the proportion equation
   22,458.69 : 30,991.52 = 12,387.20 : x
2. Step 2: Convert to fraction form
   22,458.69/30,991.52 = 12,387.20/x
3. Step 3: Cross multiply
   22,458.69x = 30,991.52 × 12,387.20
4. Step 4: Simplify right side
   22,458.69x = 383,898,032.55
5. Step 5: Solve for x
   x = 383,898,032.55/22,458.69
6. Step 6: Final answer
   x = 17,093.52