Finding the Fourth Proportional to 1,240.31, 1,711.71 and 867.42

Step by Step Solution

1. Step 1: Write the proportion equation
   1,240.31 : 1,711.71 = 867.42 : x
2. Step 2: Convert to fraction form
   1,240.31/1,711.71 = 867.42/x
3. Step 3: Cross multiply
   1,240.31x = 1,711.71 × 867.42
4. Step 4: Simplify right side
   1,240.31x = 1,484,771.49
5. Step 5: Solve for x
   x = 1,484,771.49/1,240.31
6. Step 6: Final answer
   x = 1,197.09