Finding the Fourth Proportional to 2,715.58, 4,073.78 and 866.76

Step by Step Solution

1. Step 1: Write the proportion equation
   2,715.58 : 4,073.78 = 866.76 : x
2. Step 2: Convert to fraction form
   2,715.58/4,073.78 = 866.76/x
3. Step 3: Cross multiply
   2,715.58x = 4,073.78 × 866.76
4. Step 4: Simplify right side
   2,715.58x = 3,530,989.55
5. Step 5: Solve for x
   x = 3,530,989.55/2,715.58
6. Step 6: Final answer
   x = 1,300.27