Finding the Fourth Proportional to 2,165.76, 3,247.56 and 866.16

Step by Step Solution

1. Step 1: Write the proportion equation
   2,165.76 : 3,247.56 = 866.16 : x
2. Step 2: Convert to fraction form
   2,165.76/3,247.56 = 866.16/x
3. Step 3: Cross multiply
   2,165.76x = 3,247.56 × 866.16
4. Step 4: Simplify right side
   2,165.76x = 2,812,906.57
5. Step 5: Solve for x
   x = 2,812,906.57/2,165.76
6. Step 6: Final answer
   x = 1,298.81