Finding the Fourth Proportional to 20,933.10, 31,404.78 and 10,408.08

Step by Step Solution

1. Step 1: Write the proportion equation
   20,933.10 : 31,404.78 = 10,408.08 : x
2. Step 2: Convert to fraction form
   20,933.10/31,404.78 = 10,408.08/x
3. Step 3: Cross multiply
   20,933.10x = 31,404.78 × 10,408.08
4. Step 4: Simplify right side
   20,933.10x = 326,863,462.62
5. Step 5: Solve for x
   x = 326,863,462.62/20,933.10
6. Step 6: Final answer
   x = 15,614.67