Finding the Fourth Proportional to 16,404.30, 24,586.20 and 11,139.30

Step by Step Solution

1. Step 1: Write the proportion equation
   16,404.30 : 24,586.20 = 11,139.30 : x
2. Step 2: Convert to fraction form
   16,404.30/24,586.20 = 11,139.30/x
3. Step 3: Cross multiply
   16,404.30x = 24,586.20 × 11,139.30
4. Step 4: Simplify right side
   16,404.30x = 273,873,057.66
5. Step 5: Solve for x
   x = 273,873,057.66/16,404.30
6. Step 6: Final answer
   x = 16,695.20