Finding the Fourth Proportional to 9,319.59, 12,860.76 and 5,287.16

Step by Step Solution

1. Step 1: Write the proportion equation
   9,319.59 : 12,860.76 = 5,287.16 : x
2. Step 2: Convert to fraction form
   9,319.59/12,860.76 = 5,287.16/x
3. Step 3: Cross multiply
   9,319.59x = 12,860.76 × 5,287.16
4. Step 4: Simplify right side
   9,319.59x = 67,996,831.54
5. Step 5: Solve for x
   x = 67,996,831.54/9,319.59
6. Step 6: Final answer
   x = 7,296.12