Finding the Fourth Proportional to 21,535.38, 29,721.16 and 12,585.89

Step by Step Solution

1. Step 1: Write the proportion equation
   21,535.38 : 29,721.16 = 12,585.89 : x
2. Step 2: Convert to fraction form
   21,535.38/29,721.16 = 12,585.89/x
3. Step 3: Cross multiply
   21,535.38x = 29,721.16 × 12,585.89
4. Step 4: Simplify right side
   21,535.38x = 374,067,340.47
5. Step 5: Solve for x
   x = 374,067,340.47/21,535.38
6. Step 6: Final answer
   x = 17,369.90