Finding the Fourth Proportional to 1,081.10, 1,491.56 and 708.57

Step by Step Solution

1. Step 1: Write the proportion equation
   1,081.10 : 1,491.56 = 708.57 : x
2. Step 2: Convert to fraction form
   1,081.10/1,491.56 = 708.57/x
3. Step 3: Cross multiply
   1,081.10x = 1,491.56 × 708.57
4. Step 4: Simplify right side
   1,081.10x = 1,056,871.13
5. Step 5: Solve for x
   x = 1,056,871.13/1,081.10
6. Step 6: Final answer
   x = 977.59