Finding the Fourth Proportional to 1,011.18, 1,395.39 and 591.57

Step by Step Solution

1. Step 1: Write the proportion equation
   1,011.18 : 1,395.39 = 591.57 : x
2. Step 2: Convert to fraction form
   1,011.18/1,395.39 = 591.57/x
3. Step 3: Cross multiply
   1,011.18x = 1,395.39 × 591.57
4. Step 4: Simplify right side
   1,011.18x = 825,470.86
5. Step 5: Solve for x
   x = 825,470.86/1,011.18
6. Step 6: Final answer
   x = 816.34