Finding the Fourth Proportional to 22,576.32, 31,155.52 and 12,640.32

Step by Step Solution

1. Step 1: Write the proportion equation
   22,576.32 : 31,155.52 = 12,640.32 : x
2. Step 2: Convert to fraction form
   22,576.32/31,155.52 = 12,640.32/x
3. Step 3: Cross multiply
   22,576.32x = 31,155.52 × 12,640.32
4. Step 4: Simplify right side
   22,576.32x = 393,815,742.57
5. Step 5: Solve for x
   x = 393,815,742.57/22,576.32
6. Step 6: Final answer
   x = 17,443.75