Finding the Fourth Proportional to 1,057.82, 1,459.15 and 664.52

Step by Step Solution

1. Step 1: Write the proportion equation
   1,057.82 : 1,459.15 = 664.52 : x
2. Step 2: Convert to fraction form
   1,057.82/1,459.15 = 664.52/x
3. Step 3: Cross multiply
   1,057.82x = 1,459.15 × 664.52
4. Step 4: Simplify right side
   1,057.82x = 969,625.40
5. Step 5: Solve for x
   x = 969,625.40/1,057.82
6. Step 6: Final answer
   x = 916.63