Finding the Fourth Proportional to 1,039.38, 1,434.28 and 591.24

Step by Step Solution

1. Step 1: Write the proportion equation
   1,039.38 : 1,434.28 = 591.24 : x
2. Step 2: Convert to fraction form
   1,039.38/1,434.28 = 591.24/x
3. Step 3: Cross multiply
   1,039.38x = 1,434.28 × 591.24
4. Step 4: Simplify right side
   1,039.38x = 848,003.71
5. Step 5: Solve for x
   x = 848,003.71/1,039.38
6. Step 6: Final answer
   x = 815.87