Finding the Fourth Proportional to 1,311.27, 1,968.12 and 662.46

Step by Step Solution

1. Step 1: Write the proportion equation
   1,311.27 : 1,968.12 = 662.46 : x
2. Step 2: Convert to fraction form
   1,311.27/1,968.12 = 662.46/x
3. Step 3: Cross multiply
   1,311.27x = 1,968.12 × 662.46
4. Step 4: Simplify right side
   1,311.27x = 1,303,800.78
5. Step 5: Solve for x
   x = 1,303,800.78/1,311.27
6. Step 6: Final answer
   x = 994.30