Finding the Fourth Proportional to 2,715.48, 4,073.76 and 866.28

Step by Step Solution

1. Step 1: Write the proportion equation
   2,715.48 : 4,073.76 = 866.28 : x
2. Step 2: Convert to fraction form
   2,715.48/4,073.76 = 866.28/x
3. Step 3: Cross multiply
   2,715.48x = 4,073.76 × 866.28
4. Step 4: Simplify right side
   2,715.48x = 3,529,016.81
5. Step 5: Solve for x
   x = 3,529,016.81/2,715.48
6. Step 6: Final answer
   x = 1,299.59