Finding the Fourth Proportional to 8,628.78, 12,943.47 and 2,388.27

Step by Step Solution

1. Step 1: Write the proportion equation
   8,628.78 : 12,943.47 = 2,388.27 : x
2. Step 2: Convert to fraction form
   8,628.78/12,943.47 = 2,388.27/x
3. Step 3: Cross multiply
   8,628.78x = 12,943.47 × 2,388.27
4. Step 4: Simplify right side
   8,628.78x = 30,912,489.16
5. Step 5: Solve for x
   x = 30,912,489.16/8,628.78
6. Step 6: Final answer
   x = 3,582.49