Finding the Fourth Proportional to 20,384.27, 28,118.37 and 12,818.62

Step by Step Solution

1. Step 1: Write the proportion equation
   20,384.27 : 28,118.37 = 12,818.62 : x
2. Step 2: Convert to fraction form
   20,384.27/28,118.37 = 12,818.62/x
3. Step 3: Cross multiply
   20,384.27x = 28,118.37 × 12,818.62
4. Step 4: Simplify right side
   20,384.27x = 360,438,700.05
5. Step 5: Solve for x
   x = 360,438,700.05/20,384.27
6. Step 6: Final answer
   x = 17,682.20