Finding the Fourth Proportional to 1,011.33, 1,395.36 and 591.78

Step by Step Solution

1. Step 1: Write the proportion equation
   1,011.33 : 1,395.36 = 591.78 : x
2. Step 2: Convert to fraction form
   1,011.33/1,395.36 = 591.78/x
3. Step 3: Cross multiply
   1,011.33x = 1,395.36 × 591.78
4. Step 4: Simplify right side
   1,011.33x = 825,745.67
5. Step 5: Solve for x
   x = 825,745.67/1,011.33
6. Step 6: Final answer
   x = 816.50