Finding the Fourth Proportional to 21,147.42, 29,182.18 and 11,715.30

Step by Step Solution

1. Step 1: Write the proportion equation
   21,147.42 : 29,182.18 = 11,715.30 : x
2. Step 2: Convert to fraction form
   21,147.42/29,182.18 = 11,715.30/x
3. Step 3: Cross multiply
   21,147.42x = 29,182.18 × 11,715.30
4. Step 4: Simplify right side
   21,147.42x = 341,877,934.78
5. Step 5: Solve for x
   x = 341,877,934.78/21,147.42
6. Step 6: Final answer
   x = 16,166.41