Finding the Fourth Proportional to 21,131.14, 29,153.37 and 12,744.58

Step by Step Solution

1. Step 1: Write the proportion equation
   21,131.14 : 29,153.37 = 12,744.58 : x
2. Step 2: Convert to fraction form
   21,131.14/29,153.37 = 12,744.58/x
3. Step 3: Cross multiply
   21,131.14x = 29,153.37 × 12,744.58
4. Step 4: Simplify right side
   21,131.14x = 371,547,456.23
5. Step 5: Solve for x
   x = 371,547,456.23/21,131.14
6. Step 6: Final answer
   x = 17,582.93