Finding the Fourth Proportional to 1,011.30, 1,395.46 and 591.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,011.30 : 1,395.46 = 591.72 : x
2. Step 2: Convert to fraction form
   1,011.30/1,395.46 = 591.72/x
3. Step 3: Cross multiply
   1,011.30x = 1,395.46 × 591.72
4. Step 4: Simplify right side
   1,011.30x = 825,721.59
5. Step 5: Solve for x
   x = 825,721.59/1,011.30
6. Step 6: Final answer
   x = 816.50