Finding the Fourth Proportional to 22,575.20, 31,155.72 and 13,144.64

Step by Step Solution

1. Step 1: Write the proportion equation
   22,575.20 : 31,155.72 = 13,144.64 : x
2. Step 2: Convert to fraction form
   22,575.20/31,155.72 = 13,144.64/x
3. Step 3: Cross multiply
   22,575.20x = 31,155.72 × 13,144.64
4. Step 4: Simplify right side
   22,575.20x = 409,530,723.34
5. Step 5: Solve for x
   x = 409,530,723.34/22,575.20
6. Step 6: Final answer
   x = 18,140.74