Finding the Fourth Proportional to 1,153.43, 1,591.76 and 711.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,153.43 : 1,591.76 = 711.31 : x
2. Step 2: Convert to fraction form
   1,153.43/1,591.76 = 711.31/x
3. Step 3: Cross multiply
   1,153.43x = 1,591.76 × 711.31
4. Step 4: Simplify right side
   1,153.43x = 1,132,234.81
5. Step 5: Solve for x
   x = 1,132,234.81/1,153.43
6. Step 6: Final answer
   x = 981.62