Finding the Fourth Proportional to 1,318.72, 1,977.50 and 496.42

Step by Step Solution

1. Step 1: Write the proportion equation
   1,318.72 : 1,977.50 = 496.42 : x
2. Step 2: Convert to fraction form
   1,318.72/1,977.50 = 496.42/x
3. Step 3: Cross multiply
   1,318.72x = 1,977.50 × 496.42
4. Step 4: Simplify right side
   1,318.72x = 981,670.55
5. Step 5: Solve for x
   x = 981,670.55/1,318.72
6. Step 6: Final answer
   x = 744.41