Finding the Fourth Proportional to 8,861.69, 12,230.90 and 5,087.40

Step by Step Solution

1. Step 1: Write the proportion equation
   8,861.69 : 12,230.90 = 5,087.40 : x
2. Step 2: Convert to fraction form
   8,861.69/12,230.90 = 5,087.40/x
3. Step 3: Cross multiply
   8,861.69x = 12,230.90 × 5,087.40
4. Step 4: Simplify right side
   8,861.69x = 62,223,520.17
5. Step 5: Solve for x
   x = 62,223,520.17/8,861.69
6. Step 6: Final answer
   x = 7,021.63