Finding the Fourth Proportional to 22,550.68, 31,128.66 and 20,188.72

Step by Step Solution

1. Step 1: Write the proportion equation
   22,550.68 : 31,128.66 = 20,188.72 : x
2. Step 2: Convert to fraction form
   22,550.68/31,128.66 = 20,188.72/x
3. Step 3: Cross multiply
   22,550.68x = 31,128.66 × 20,188.72
4. Step 4: Simplify right side
   22,550.68x = 628,447,800.72
5. Step 5: Solve for x
   x = 628,447,800.72/22,550.68
6. Step 6: Final answer
   x = 27,868.24