Finding the Fourth Proportional to 1,039.48, 1,434.71 and 708.69

Step by Step Solution

1. Step 1: Write the proportion equation
   1,039.48 : 1,434.71 = 708.69 : x
2. Step 2: Convert to fraction form
   1,039.48/1,434.71 = 708.69/x
3. Step 3: Cross multiply
   1,039.48x = 1,434.71 × 708.69
4. Step 4: Simplify right side
   1,039.48x = 1,016,761.09
5. Step 5: Solve for x
   x = 1,016,761.09/1,039.48
6. Step 6: Final answer
   x = 978.15