Finding the Fourth Proportional to 1,271.42, 1,906.78 and 449.58

Step by Step Solution

1. Step 1: Write the proportion equation
   1,271.42 : 1,906.78 = 449.58 : x
2. Step 2: Convert to fraction form
   1,271.42/1,906.78 = 449.58/x
3. Step 3: Cross multiply
   1,271.42x = 1,906.78 × 449.58
4. Step 4: Simplify right side
   1,271.42x = 857,250.15
5. Step 5: Solve for x
   x = 857,250.15/1,271.42
6. Step 6: Final answer
   x = 674.25