Finding the Fourth Proportional to 12,868.80, 17,760.96 and 9,330.72

Step by Step Solution

1. Step 1: Write the proportion equation
   12,868.80 : 17,760.96 = 9,330.72 : x
2. Step 2: Convert to fraction form
   12,868.80/17,760.96 = 9,330.72/x
3. Step 3: Cross multiply
   12,868.80x = 17,760.96 × 9,330.72
4. Step 4: Simplify right side
   12,868.80x = 165,722,544.69
5. Step 5: Solve for x
   x = 165,722,544.69/12,868.80
6. Step 6: Final answer
   x = 12,877.86