Finding the Fourth Proportional to 12,229.56, 18,347.31 and 3,909.57

Step by Step Solution

1. Step 1: Write the proportion equation
   12,229.56 : 18,347.31 = 3,909.57 : x
2. Step 2: Convert to fraction form
   12,229.56/18,347.31 = 3,909.57/x
3. Step 3: Cross multiply
   12,229.56x = 18,347.31 × 3,909.57
4. Step 4: Simplify right side
   12,229.56x = 71,730,092.76
5. Step 5: Solve for x
   x = 71,730,092.76/12,229.56
6. Step 6: Final answer
   x = 5,865.30