Finding the Fourth Proportional to 1,039.86, 1,434.92 and 591.61

Step by Step Solution

1. Step 1: Write the proportion equation
   1,039.86 : 1,434.92 = 591.61 : x
2. Step 2: Convert to fraction form
   1,039.86/1,434.92 = 591.61/x
3. Step 3: Cross multiply
   1,039.86x = 1,434.92 × 591.61
4. Step 4: Simplify right side
   1,039.86x = 848,921.22
5. Step 5: Solve for x
   x = 848,921.22/1,039.86
6. Step 6: Final answer
   x = 816.38