Finding the Fourth Proportional to 1,039.71, 1,434.69 and 591.60

Step by Step Solution

1. Step 1: Write the proportion equation
   1,039.71 : 1,434.69 = 591.60 : x
2. Step 2: Convert to fraction form
   1,039.71/1,434.69 = 591.60/x
3. Step 3: Cross multiply
   1,039.71x = 1,434.69 × 591.60
4. Step 4: Simplify right side
   1,039.71x = 848,762.60
5. Step 5: Solve for x
   x = 848,762.60/1,039.71
6. Step 6: Final answer
   x = 816.35