Finding the Fourth Proportional to 21,580.86, 29,782.17 and 12,149.76

Step by Step Solution

1. Step 1: Write the proportion equation
   21,580.86 : 29,782.17 = 12,149.76 : x
2. Step 2: Convert to fraction form
   21,580.86/29,782.17 = 12,149.76/x
3. Step 3: Cross multiply
   21,580.86x = 29,782.17 × 12,149.76
4. Step 4: Simplify right side
   21,580.86x = 361,846,217.78
5. Step 5: Solve for x
   x = 361,846,217.78/21,580.86
6. Step 6: Final answer
   x = 16,767.00