Finding the Fourth Proportional to 16,430.72, 22,674.46 and 8,978.72

Step by Step Solution

1. Step 1: Write the proportion equation
   16,430.72 : 22,674.46 = 8,978.72 : x
2. Step 2: Convert to fraction form
   16,430.72/22,674.46 = 8,978.72/x
3. Step 3: Cross multiply
   16,430.72x = 22,674.46 × 8,978.72
4. Step 4: Simplify right side
   16,430.72x = 203,587,627.49
5. Step 5: Solve for x
   x = 203,587,627.49/16,430.72
6. Step 6: Final answer
   x = 12,390.67