Finding the Fourth Proportional to 8,628.20, 12,942.59 and 2,387.69

Step by Step Solution

1. Step 1: Write the proportion equation
   8,628.20 : 12,942.59 = 2,387.69 : x
2. Step 2: Convert to fraction form
   8,628.20/12,942.59 = 2,387.69/x
3. Step 3: Cross multiply
   8,628.20x = 12,942.59 × 2,387.69
4. Step 4: Simplify right side
   8,628.20x = 30,902,931.04
5. Step 5: Solve for x
   x = 30,902,931.04/8,628.20
6. Step 6: Final answer
   x = 3,581.62