Finding the Fourth Proportional to 21,706.10, 29,952.82 and 12,144.72

Step by Step Solution

1. Step 1: Write the proportion equation
   21,706.10 : 29,952.82 = 12,144.72 : x
2. Step 2: Convert to fraction form
   21,706.10/29,952.82 = 12,144.72/x
3. Step 3: Cross multiply
   21,706.10x = 29,952.82 × 12,144.72
4. Step 4: Simplify right side
   21,706.10x = 363,768,612.11
5. Step 5: Solve for x
   x = 363,768,612.11/21,706.10
6. Step 6: Final answer
   x = 16,758.82