Finding the Fourth Proportional to 1,665.48, 2,498.58 and 495.57

Step by Step Solution

1. Step 1: Write the proportion equation
   1,665.48 : 2,498.58 = 495.57 : x
2. Step 2: Convert to fraction form
   1,665.48/2,498.58 = 495.57/x
3. Step 3: Cross multiply
   1,665.48x = 2,498.58 × 495.57
4. Step 4: Simplify right side
   1,665.48x = 1,238,221.29
5. Step 5: Solve for x
   x = 1,238,221.29/1,665.48
6. Step 6: Final answer
   x = 743.46