Finding the Fourth Proportional to 1,111.55, 1,666.76 and 495.45

Step by Step Solution

1. Step 1: Write the proportion equation
   1,111.55 : 1,666.76 = 495.45 : x
2. Step 2: Convert to fraction form
   1,111.55/1,666.76 = 495.45/x
3. Step 3: Cross multiply
   1,111.55x = 1,666.76 × 495.45
4. Step 4: Simplify right side
   1,111.55x = 825,793.76
5. Step 5: Solve for x
   x = 825,793.76/1,111.55
6. Step 6: Final answer
   x = 742.92