Finding the Fourth Proportional to 1,039.71, 1,434.78 and 567.61

Step by Step Solution

1. Step 1: Write the proportion equation
   1,039.71 : 1,434.78 = 567.61 : x
2. Step 2: Convert to fraction form
   1,039.71/1,434.78 = 567.61/x
3. Step 3: Cross multiply
   1,039.71x = 1,434.78 × 567.61
4. Step 4: Simplify right side
   1,039.71x = 814,395.92
5. Step 5: Solve for x
   x = 814,395.92/1,039.71
6. Step 6: Final answer
   x = 783.29