Finding the Fourth Proportional to 1,008.50, 1,513.30 and 495.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,008.50 : 1,513.30 = 495.50 : x
2. Step 2: Convert to fraction form
   1,008.50/1,513.30 = 495.50/x
3. Step 3: Cross multiply
   1,008.50x = 1,513.30 × 495.50
4. Step 4: Simplify right side
   1,008.50x = 749,840.15
5. Step 5: Solve for x
   x = 749,840.15/1,008.50
6. Step 6: Final answer
   x = 743.52