Finding the Fourth Proportional to 21,404.16, 29,513.88 and 13,436.64

Step by Step Solution

1. Step 1: Write the proportion equation
   21,404.16 : 29,513.88 = 13,436.64 : x
2. Step 2: Convert to fraction form
   21,404.16/29,513.88 = 13,436.64/x
3. Step 3: Cross multiply
   21,404.16x = 29,513.88 × 13,436.64
4. Step 4: Simplify right side
   21,404.16x = 396,567,380.56
5. Step 5: Solve for x
   x = 396,567,380.56/21,404.16
6. Step 6: Final answer
   x = 18,527.58