Finding the Fourth Proportional to 21,563.10, 29,755.83 and 12,131.10

Step by Step Solution

1. Step 1: Write the proportion equation
   21,563.10 : 29,755.83 = 12,131.10 : x
2. Step 2: Convert to fraction form
   21,563.10/29,755.83 = 12,131.10/x
3. Step 3: Cross multiply
   21,563.10x = 29,755.83 × 12,131.10
4. Step 4: Simplify right side
   21,563.10x = 360,970,949.31
5. Step 5: Solve for x
   x = 360,970,949.31/21,563.10
6. Step 6: Final answer
   x = 16,740.22