Finding the Fourth Proportional to 21,429.32, 29,568.94 and 13,465.90

Step by Step Solution

1. Step 1: Write the proportion equation
   21,429.32 : 29,568.94 = 13,465.90 : x
2. Step 2: Convert to fraction form
   21,429.32/29,568.94 = 13,465.90/x
3. Step 3: Cross multiply
   21,429.32x = 29,568.94 × 13,465.90
4. Step 4: Simplify right side
   21,429.32x = 398,172,389.15
5. Step 5: Solve for x
   x = 398,172,389.15/21,429.32
6. Step 6: Final answer
   x = 18,580.73