Finding the Fourth Proportional to 12,387.35, 18,566.71 and 5,709.89

Step by Step Solution

1. Step 1: Write the proportion equation
   12,387.35 : 18,566.71 = 5,709.89 : x
2. Step 2: Convert to fraction form
   12,387.35/18,566.71 = 5,709.89/x
3. Step 3: Cross multiply
   12,387.35x = 18,566.71 × 5,709.89
4. Step 4: Simplify right side
   12,387.35x = 106,013,871.76
5. Step 5: Solve for x
   x = 106,013,871.76/12,387.35
6. Step 6: Final answer
   x = 8,558.24