Finding the Fourth Proportional to 12,640.32, 18,949.32 and 5,240.16

Step by Step Solution

1. Step 1: Write the proportion equation
   12,640.32 : 18,949.32 = 5,240.16 : x
2. Step 2: Convert to fraction form
   12,640.32/18,949.32 = 5,240.16/x
3. Step 3: Cross multiply
   12,640.32x = 18,949.32 × 5,240.16
4. Step 4: Simplify right side
   12,640.32x = 99,297,468.69
5. Step 5: Solve for x
   x = 99,297,468.69/12,640.32
6. Step 6: Final answer
   x = 7,855.61