Finding the Fourth Proportional to 11,080.32, 15,288.62 and 9,399.12

Step by Step Solution

1. Step 1: Write the proportion equation
   11,080.32 : 15,288.62 = 9,399.12 : x
2. Step 2: Convert to fraction form
   11,080.32/15,288.62 = 9,399.12/x
3. Step 3: Cross multiply
   11,080.32x = 15,288.62 × 9,399.12
4. Step 4: Simplify right side
   11,080.32x = 143,699,527.02
5. Step 5: Solve for x
   x = 143,699,527.02/11,080.32
6. Step 6: Final answer
   x = 12,968.90