Finding the Fourth Proportional to 8,831.09, 13,254.23 and 5,128.18

Step by Step Solution

1. Step 1: Write the proportion equation
   8,831.09 : 13,254.23 = 5,128.18 : x
2. Step 2: Convert to fraction form
   8,831.09/13,254.23 = 5,128.18/x
3. Step 3: Cross multiply
   8,831.09x = 13,254.23 × 5,128.18
4. Step 4: Simplify right side
   8,831.09x = 67,970,056.89
5. Step 5: Solve for x
   x = 67,970,056.89/8,831.09
6. Step 6: Final answer
   x = 7,696.68