Finding the Fourth Proportional to 20,384.20, 28,118.24 and 12,818.53

Step by Step Solution

1. Step 1: Write the proportion equation
   20,384.20 : 28,118.24 = 12,818.53 : x
2. Step 2: Convert to fraction form
   20,384.20/28,118.24 = 12,818.53/x
3. Step 3: Cross multiply
   20,384.20x = 28,118.24 × 12,818.53
4. Step 4: Simplify right side
   20,384.20x = 360,434,362.40
5. Step 5: Solve for x
   x = 360,434,362.40/20,384.20
6. Step 6: Final answer
   x = 17,682.05