Finding the Fourth Proportional to 21,196.05, 29,250.67 and 13,242.89

Step by Step Solution

1. Step 1: Write the proportion equation
   21,196.05 : 29,250.67 = 13,242.89 : x
2. Step 2: Convert to fraction form
   21,196.05/29,250.67 = 13,242.89/x
3. Step 3: Cross multiply
   21,196.05x = 29,250.67 × 13,242.89
4. Step 4: Simplify right side
   21,196.05x = 387,363,470.09
5. Step 5: Solve for x
   x = 387,363,470.09/21,196.05
6. Step 6: Final answer
   x = 18,275.26