Finding the Fourth Proportional to 20,867.62, 31,308.72 and 9,181.75

Step by Step Solution

1. Step 1: Write the proportion equation
   20,867.62 : 31,308.72 = 9,181.75 : x
2. Step 2: Convert to fraction form
   20,867.62/31,308.72 = 9,181.75/x
3. Step 3: Cross multiply
   20,867.62x = 31,308.72 × 9,181.75
4. Step 4: Simplify right side
   20,867.62x = 287,468,839.86
5. Step 5: Solve for x
   x = 287,468,839.86/20,867.62
6. Step 6: Final answer
   x = 13,775.83