Finding the Fourth Proportional to 1,057.47, 1,459.31 and 591.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,057.47 : 1,459.31 = 591.72 : x
2. Step 2: Convert to fraction form
   1,057.47/1,459.31 = 591.72/x
3. Step 3: Cross multiply
   1,057.47x = 1,459.31 × 591.72
4. Step 4: Simplify right side
   1,057.47x = 863,501.43
5. Step 5: Solve for x
   x = 863,501.43/1,057.47
6. Step 6: Final answer
   x = 816.57