Finding the Fourth Proportional to 21,137.18, 29,168.53 and 12,185.06

Step by Step Solution

1. Step 1: Write the proportion equation
   21,137.18 : 29,168.53 = 12,185.06 : x
2. Step 2: Convert to fraction form
   21,137.18/29,168.53 = 12,185.06/x
3. Step 3: Cross multiply
   21,137.18x = 29,168.53 × 12,185.06
4. Step 4: Simplify right side
   21,137.18x = 355,420,111.86
5. Step 5: Solve for x
   x = 355,420,111.86/21,137.18
6. Step 6: Final answer
   x = 16,814.93