Finding the Fourth Proportional to 8,871.43, 12,248.28 and 5,518.81

Step by Step Solution

1. Step 1: Write the proportion equation
   8,871.43 : 12,248.28 = 5,518.81 : x
2. Step 2: Convert to fraction form
   8,871.43/12,248.28 = 5,518.81/x
3. Step 3: Cross multiply
   8,871.43x = 12,248.28 × 5,518.81
4. Step 4: Simplify right side
   8,871.43x = 67,595,930.15
5. Step 5: Solve for x
   x = 67,595,930.15/8,871.43
6. Step 6: Final answer
   x = 7,619.51