Finding the Fourth Proportional to 2,426.32, 3,639.30 and 866.15

Step by Step Solution

1. Step 1: Write the proportion equation
   2,426.32 : 3,639.30 = 866.15 : x
2. Step 2: Convert to fraction form
   2,426.32/3,639.30 = 866.15/x
3. Step 3: Cross multiply
   2,426.32x = 3,639.30 × 866.15
4. Step 4: Simplify right side
   2,426.32x = 3,152,164.75
5. Step 5: Solve for x
   x = 3,152,164.75/2,426.32
6. Step 6: Final answer
   x = 1,299.16