Finding the Fourth Proportional to 21,369.78, 29,488.29 and 12,417.18

Step by Step Solution

1. Step 1: Write the proportion equation
   21,369.78 : 29,488.29 = 12,417.18 : x
2. Step 2: Convert to fraction form
   21,369.78/29,488.29 = 12,417.18/x
3. Step 3: Cross multiply
   21,369.78x = 29,488.29 × 12,417.18
4. Step 4: Simplify right side
   21,369.78x = 366,161,404.82
5. Step 5: Solve for x
   x = 366,161,404.82/21,369.78
6. Step 6: Final answer
   x = 17,134.54