Finding the Fourth Proportional to 868.72, 1,303.50 and 866.08

Step by Step Solution

1. Step 1: Write the proportion equation
   868.72 : 1,303.50 = 866.08 : x
2. Step 2: Convert to fraction form
   868.72/1,303.50 = 866.08/x
3. Step 3: Cross multiply
   868.72x = 1,303.50 × 866.08
4. Step 4: Simplify right side
   868.72x = 1,128,935.28
5. Step 5: Solve for x
   x = 1,128,935.28/868.72
6. Step 6: Final answer
   x = 1,299.54