Finding the Fourth Proportional to 21,078.50, 29,093.18 and 12,131.17

Step by Step Solution

1. Step 1: Write the proportion equation
   21,078.50 : 29,093.18 = 12,131.17 : x
2. Step 2: Convert to fraction form
   21,078.50/29,093.18 = 12,131.17/x
3. Step 3: Cross multiply
   21,078.50x = 29,093.18 × 12,131.17
4. Step 4: Simplify right side
   21,078.50x = 352,934,179.03
5. Step 5: Solve for x
   x = 352,934,179.03/21,078.50
6. Step 6: Final answer
   x = 16,743.80