Finding the Fourth Proportional to 22,576.50, 31,155.60 and 12,640.50

Step by Step Solution

1. Step 1: Write the proportion equation
   22,576.50 : 31,155.60 = 12,640.50 : x
2. Step 2: Convert to fraction form
   22,576.50/31,155.60 = 12,640.50/x
3. Step 3: Cross multiply
   22,576.50x = 31,155.60 × 12,640.50
4. Step 4: Simplify right side
   22,576.50x = 393,822,361.80
5. Step 5: Solve for x
   x = 393,822,361.80/22,576.50
6. Step 6: Final answer
   x = 17,443.91