Finding the Fourth Proportional to 1,139.37, 1,700.70 and 864.17

Step by Step Solution

1. Step 1: Write the proportion equation
   1,139.37 : 1,700.70 = 864.17 : x
2. Step 2: Convert to fraction form
   1,139.37/1,700.70 = 864.17/x
3. Step 3: Cross multiply
   1,139.37x = 1,700.70 × 864.17
4. Step 4: Simplify right side
   1,139.37x = 1,469,688.55
5. Step 5: Solve for x
   x = 1,469,688.55/1,139.37
6. Step 6: Final answer
   x = 1,289.92