Finding the Fourth Proportional to 12,149.59, 18,216.61 and 5,127.70

Step by Step Solution

1. Step 1: Write the proportion equation
   12,149.59 : 18,216.61 = 5,127.70 : x
2. Step 2: Convert to fraction form
   12,149.59/18,216.61 = 5,127.70/x
3. Step 3: Cross multiply
   12,149.59x = 18,216.61 × 5,127.70
4. Step 4: Simplify right side
   12,149.59x = 93,409,311.10
5. Step 5: Solve for x
   x = 93,409,311.10/12,149.59
6. Step 6: Final answer
   x = 7,688.27