Finding the Fourth Proportional to 1,065.78, 1,597.59 and 449.91

Step by Step Solution

1. Step 1: Write the proportion equation
   1,065.78 : 1,597.59 = 449.91 : x
2. Step 2: Convert to fraction form
   1,065.78/1,597.59 = 449.91/x
3. Step 3: Cross multiply
   1,065.78x = 1,597.59 × 449.91
4. Step 4: Simplify right side
   1,065.78x = 718,771.72
5. Step 5: Solve for x
   x = 718,771.72/1,065.78
6. Step 6: Final answer
   x = 674.41