Finding the Fourth Proportional to 1,275.55, 1,912.31 and 495.52

Step by Step Solution

1. Step 1: Write the proportion equation
   1,275.55 : 1,912.31 = 495.52 : x
2. Step 2: Convert to fraction form
   1,275.55/1,912.31 = 495.52/x
3. Step 3: Cross multiply
   1,275.55x = 1,912.31 × 495.52
4. Step 4: Simplify right side
   1,275.55x = 947,582.45
5. Step 5: Solve for x
   x = 947,582.45/1,275.55
6. Step 6: Final answer
   x = 742.88