Finding the Fourth Proportional to 11,329.56, 15,639.00 and 9,729.78

Step by Step Solution

1. Step 1: Write the proportion equation
   11,329.56 : 15,639.00 = 9,729.78 : x
2. Step 2: Convert to fraction form
   11,329.56/15,639.00 = 9,729.78/x
3. Step 3: Cross multiply
   11,329.56x = 15,639.00 × 9,729.78
4. Step 4: Simplify right side
   11,329.56x = 152,164,005.10
5. Step 5: Solve for x
   x = 152,164,005.10/11,329.56
6. Step 6: Final answer
   x = 13,430.71