Finding the Fourth Proportional to 21,397.29, 29,535.12 and 12,443.10

Step by Step Solution

1. Step 1: Write the proportion equation
   21,397.29 : 29,535.12 = 12,443.10 : x
2. Step 2: Convert to fraction form
   21,397.29/29,535.12 = 12,443.10/x
3. Step 3: Cross multiply
   21,397.29x = 29,535.12 × 12,443.10
4. Step 4: Simplify right side
   21,397.29x = 367,508,451.67
5. Step 5: Solve for x
   x = 367,508,451.67/21,397.29
6. Step 6: Final answer
   x = 17,175.47