Finding the Fourth Proportional to 1,271.55, 1,908.18 and 449.83

Step by Step Solution

1. Step 1: Write the proportion equation
   1,271.55 : 1,908.18 = 449.83 : x
2. Step 2: Convert to fraction form
   1,271.55/1,908.18 = 449.83/x
3. Step 3: Cross multiply
   1,271.55x = 1,908.18 × 449.83
4. Step 4: Simplify right side
   1,271.55x = 858,356.61
5. Step 5: Solve for x
   x = 858,356.61/1,271.55
6. Step 6: Final answer
   x = 675.05