Finding the Fourth Proportional to 2,715.55, 4,073.73 and 866.12

Step by Step Solution

1. Step 1: Write the proportion equation
   2,715.55 : 4,073.73 = 866.12 : x
2. Step 2: Convert to fraction form
   2,715.55/4,073.73 = 866.12/x
3. Step 3: Cross multiply
   2,715.55x = 4,073.73 × 866.12
4. Step 4: Simplify right side
   2,715.55x = 3,528,339.03
5. Step 5: Solve for x
   x = 3,528,339.03/2,715.55
6. Step 6: Final answer
   x = 1,299.31