Finding the Fourth Proportional to 1,014.72, 1,399.44 and 665.52

Step by Step Solution

1. Step 1: Write the proportion equation
   1,014.72 : 1,399.44 = 665.52 : x
2. Step 2: Convert to fraction form
   1,014.72/1,399.44 = 665.52/x
3. Step 3: Cross multiply
   1,014.72x = 1,399.44 × 665.52
4. Step 4: Simplify right side
   1,014.72x = 931,355.31
5. Step 5: Solve for x
   x = 931,355.31/1,014.72
6. Step 6: Final answer
   x = 917.84