Finding the Fourth Proportional to 1,142.89, 1,713.42 and 449.73

Step by Step Solution

1. Step 1: Write the proportion equation
   1,142.89 : 1,713.42 = 449.73 : x
2. Step 2: Convert to fraction form
   1,142.89/1,713.42 = 449.73/x
3. Step 3: Cross multiply
   1,142.89x = 1,713.42 × 449.73
4. Step 4: Simplify right side
   1,142.89x = 770,576.38
5. Step 5: Solve for x
   x = 770,576.38/1,142.89
6. Step 6: Final answer
   x = 674.23