Finding the Fourth Proportional to 1,665.20, 2,498.18 and 495.17

Step by Step Solution

1. Step 1: Write the proportion equation
   1,665.20 : 2,498.18 = 495.17 : x
2. Step 2: Convert to fraction form
   1,665.20/2,498.18 = 495.17/x
3. Step 3: Cross multiply
   1,665.20x = 2,498.18 × 495.17
4. Step 4: Simplify right side
   1,665.20x = 1,237,021.31
5. Step 5: Solve for x
   x = 1,237,021.31/1,665.20
6. Step 6: Final answer
   x = 742.87