Finding the Fourth Proportional to 22,320.72, 33,489.52 and 11,790.31

Step by Step Solution

1. Step 1: Write the proportion equation
   22,320.72 : 33,489.52 = 11,790.31 : x
2. Step 2: Convert to fraction form
   22,320.72/33,489.52 = 11,790.31/x
3. Step 3: Cross multiply
   22,320.72x = 33,489.52 × 11,790.31
4. Step 4: Simplify right side
   22,320.72x = 394,851,822.55
5. Step 5: Solve for x
   x = 394,851,822.55/22,320.72
6. Step 6: Final answer
   x = 17,689.92