Finding the Fourth Proportional to 1,143.84, 1,717.56 and 939.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,143.84 : 1,717.56 = 939.72 : x
2. Step 2: Convert to fraction form
   1,143.84/1,717.56 = 939.72/x
3. Step 3: Cross multiply
   1,143.84x = 1,717.56 × 939.72
4. Step 4: Simplify right side
   1,143.84x = 1,614,025.48
5. Step 5: Solve for x
   x = 1,614,025.48/1,143.84
6. Step 6: Final answer
   x = 1,411.06