Finding the Fourth Proportional to 2,426.24, 3,639.68 and 866.56

Step by Step Solution

1. Step 1: Write the proportion equation
   2,426.24 : 3,639.68 = 866.56 : x
2. Step 2: Convert to fraction form
   2,426.24/3,639.68 = 866.56/x
3. Step 3: Cross multiply
   2,426.24x = 3,639.68 × 866.56
4. Step 4: Simplify right side
   2,426.24x = 3,154,001.10
5. Step 5: Solve for x
   x = 3,154,001.10/2,426.24
6. Step 6: Final answer
   x = 1,299.95