Finding the Fourth Proportional to 1,057.69, 1,459.25 and 664.93

Step by Step Solution

1. Step 1: Write the proportion equation
   1,057.69 : 1,459.25 = 664.93 : x
2. Step 2: Convert to fraction form
   1,057.69/1,459.25 = 664.93/x
3. Step 3: Cross multiply
   1,057.69x = 1,459.25 × 664.93
4. Step 4: Simplify right side
   1,057.69x = 970,295.78
5. Step 5: Solve for x
   x = 970,295.78/1,057.69
6. Step 6: Final answer
   x = 917.37