Finding the Fourth Proportional to 20,384.82, 28,119.11 and 12,819.15

Step by Step Solution

1. Step 1: Write the proportion equation
   20,384.82 : 28,119.11 = 12,819.15 : x
2. Step 2: Convert to fraction form
   20,384.82/28,119.11 = 12,819.15/x
3. Step 3: Cross multiply
   20,384.82x = 28,119.11 × 12,819.15
4. Step 4: Simplify right side
   20,384.82x = 360,463,024.86
5. Step 5: Solve for x
   x = 360,463,024.86/20,384.82
6. Step 6: Final answer
   x = 17,682.91