Finding the Fourth Proportional to 20,078.96, 30,128.72 and 9,560.88

Step by Step Solution

1. Step 1: Write the proportion equation
   20,078.96 : 30,128.72 = 9,560.88 : x
2. Step 2: Convert to fraction form
   20,078.96/30,128.72 = 9,560.88/x
3. Step 3: Cross multiply
   20,078.96x = 30,128.72 × 9,560.88
4. Step 4: Simplify right side
   20,078.96x = 288,057,076.47
5. Step 5: Solve for x
   x = 288,057,076.47/20,078.96
6. Step 6: Final answer
   x = 14,346.21