Finding the Fourth Proportional to 1,153.12, 1,591.50 and 710.86

Step by Step Solution

1. Step 1: Write the proportion equation
   1,153.12 : 1,591.50 = 710.86 : x
2. Step 2: Convert to fraction form
   1,153.12/1,591.50 = 710.86/x
3. Step 3: Cross multiply
   1,153.12x = 1,591.50 × 710.86
4. Step 4: Simplify right side
   1,153.12x = 1,131,333.69
5. Step 5: Solve for x
   x = 1,131,333.69/1,153.12
6. Step 6: Final answer
   x = 981.11