Finding the Fourth Proportional to 20,818.42, 28,727.33 and 11,865.42

Step by Step Solution

1. Step 1: Write the proportion equation
   20,818.42 : 28,727.33 = 11,865.42 : x
2. Step 2: Convert to fraction form
   20,818.42/28,727.33 = 11,865.42/x
3. Step 3: Cross multiply
   20,818.42x = 28,727.33 × 11,865.42
4. Step 4: Simplify right side
   20,818.42x = 340,861,776.60
5. Step 5: Solve for x
   x = 340,861,776.60/20,818.42
6. Step 6: Final answer
   x = 16,373.09