Finding the Fourth Proportional to 8,831.07, 12,181.81 and 5,513.31

Step by Step Solution

1. Step 1: Write the proportion equation
   8,831.07 : 12,181.81 = 5,513.31 : x
2. Step 2: Convert to fraction form
   8,831.07/12,181.81 = 5,513.31/x
3. Step 3: Cross multiply
   8,831.07x = 12,181.81 × 5,513.31
4. Step 4: Simplify right side
   8,831.07x = 67,162,125.35
5. Step 5: Solve for x
   x = 67,162,125.35/8,831.07
6. Step 6: Final answer
   x = 7,605.21