Finding the Fourth Proportional to 21,158.43, 29,196.57 and 12,658.83

Step by Step Solution

1. Step 1: Write the proportion equation
   21,158.43 : 29,196.57 = 12,658.83 : x
2. Step 2: Convert to fraction form
   21,158.43/29,196.57 = 12,658.83/x
3. Step 3: Cross multiply
   21,158.43x = 29,196.57 × 12,658.83
4. Step 4: Simplify right side
   21,158.43x = 369,594,416.21
5. Step 5: Solve for x
   x = 369,594,416.21/21,158.43
6. Step 6: Final answer
   x = 17,467.95