Finding the Fourth Proportional to 10,978.24, 15,119.58 and 9,485.68

Step by Step Solution

1. Step 1: Write the proportion equation
   10,978.24 : 15,119.58 = 9,485.68 : x
2. Step 2: Convert to fraction form
   10,978.24/15,119.58 = 9,485.68/x
3. Step 3: Cross multiply
   10,978.24x = 15,119.58 × 9,485.68
4. Step 4: Simplify right side
   10,978.24x = 143,419,497.61
5. Step 5: Solve for x
   x = 143,419,497.61/10,978.24
6. Step 6: Final answer
   x = 13,063.98