Finding the Fourth Proportional to 2,426.33, 3,640.27 and 866.30

Step by Step Solution

1. Step 1: Write the proportion equation
   2,426.33 : 3,640.27 = 866.30 : x
2. Step 2: Convert to fraction form
   2,426.33/3,640.27 = 866.30/x
3. Step 3: Cross multiply
   2,426.33x = 3,640.27 × 866.30
4. Step 4: Simplify right side
   2,426.33x = 3,153,579.55
5. Step 5: Solve for x
   x = 3,153,579.55/2,426.33
6. Step 6: Final answer
   x = 1,299.73