Finding the Fourth Proportional to 16,589.76, 22,915.68 and 12,390.72

Step by Step Solution

1. Step 1: Write the proportion equation
   16,589.76 : 22,915.68 = 12,390.72 : x
2. Step 2: Convert to fraction form
   16,589.76/22,915.68 = 12,390.72/x
3. Step 3: Cross multiply
   16,589.76x = 22,915.68 × 12,390.72
4. Step 4: Simplify right side
   16,589.76x = 283,941,774.49
5. Step 5: Solve for x
   x = 283,941,774.49/16,589.76
6. Step 6: Final answer
   x = 17,115.48