Finding the Fourth Proportional to 1,011.21, 1,395.43 and 591.58

Step by Step Solution

1. Step 1: Write the proportion equation
   1,011.21 : 1,395.43 = 591.58 : x
2. Step 2: Convert to fraction form
   1,011.21/1,395.43 = 591.58/x
3. Step 3: Cross multiply
   1,011.21x = 1,395.43 × 591.58
4. Step 4: Simplify right side
   1,011.21x = 825,498.54
5. Step 5: Solve for x
   x = 825,498.54/1,011.21
6. Step 6: Final answer
   x = 816.35