Finding the Fourth Proportional to 8,628.72, 12,943.37 and 2,388.21

Step by Step Solution

1. Step 1: Write the proportion equation
   8,628.72 : 12,943.37 = 2,388.21 : x
2. Step 2: Convert to fraction form
   8,628.72/12,943.37 = 2,388.21/x
3. Step 3: Cross multiply
   8,628.72x = 12,943.37 × 2,388.21
4. Step 4: Simplify right side
   8,628.72x = 30,911,485.67
5. Step 5: Solve for x
   x = 30,911,485.67/8,628.72
6. Step 6: Final answer
   x = 3,582.40