Finding the Fourth Proportional to 10,861.87, 14,989.88 and 8,499.91

Step by Step Solution

1. Step 1: Write the proportion equation
   10,861.87 : 14,989.88 = 8,499.91 : x
2. Step 2: Convert to fraction form
   10,861.87/14,989.88 = 8,499.91/x
3. Step 3: Cross multiply
   10,861.87x = 14,989.88 × 8,499.91
4. Step 4: Simplify right side
   10,861.87x = 127,412,630.91
5. Step 5: Solve for x
   x = 127,412,630.91/10,861.87
6. Step 6: Final answer
   x = 11,730.27