Finding the Fourth Proportional to 1,057.39, 1,459.16 and 591.61

Step by Step Solution

1. Step 1: Write the proportion equation
   1,057.39 : 1,459.16 = 591.61 : x
2. Step 2: Convert to fraction form
   1,057.39/1,459.16 = 591.61/x
3. Step 3: Cross multiply
   1,057.39x = 1,459.16 × 591.61
4. Step 4: Simplify right side
   1,057.39x = 863,250.69
5. Step 5: Solve for x
   x = 863,250.69/1,057.39
6. Step 6: Final answer
   x = 816.40