Finding the Fourth Proportional to 1,057.86, 1,459.89 and 665.37

Step by Step Solution

1. Step 1: Write the proportion equation
   1,057.86 : 1,459.89 = 665.37 : x
2. Step 2: Convert to fraction form
   1,057.86/1,459.89 = 665.37/x
3. Step 3: Cross multiply
   1,057.86x = 1,459.89 × 665.37
4. Step 4: Simplify right side
   1,057.86x = 971,367.01
5. Step 5: Solve for x
   x = 971,367.01/1,057.86
6. Step 6: Final answer
   x = 918.24