Finding the Fourth Proportional to 1,081.85, 1,491.98 and 708.71

Step by Step Solution

1. Step 1: Write the proportion equation
   1,081.85 : 1,491.98 = 708.71 : x
2. Step 2: Convert to fraction form
   1,081.85/1,491.98 = 708.71/x
3. Step 3: Cross multiply
   1,081.85x = 1,491.98 × 708.71
4. Step 4: Simplify right side
   1,081.85x = 1,057,377.60
5. Step 5: Solve for x
   x = 1,057,377.60/1,081.85
6. Step 6: Final answer
   x = 977.38