Finding the Fourth Proportional to 9,660.78, 14,472.18 and 5,488.29

Step by Step Solution

1. Step 1: Write the proportion equation
   9,660.78 : 14,472.18 = 5,488.29 : x
2. Step 2: Convert to fraction form
   9,660.78/14,472.18 = 5,488.29/x
3. Step 3: Cross multiply
   9,660.78x = 14,472.18 × 5,488.29
4. Step 4: Simplify right side
   9,660.78x = 79,427,520.77
5. Step 5: Solve for x
   x = 79,427,520.77/9,660.78
6. Step 6: Final answer
   x = 8,221.65