Finding the Fourth Proportional to 1,240.69, 1,859.72 and 449.52

Step by Step Solution

1. Step 1: Write the proportion equation
   1,240.69 : 1,859.72 = 449.52 : x
2. Step 2: Convert to fraction form
   1,240.69/1,859.72 = 449.52/x
3. Step 3: Cross multiply
   1,240.69x = 1,859.72 × 449.52
4. Step 4: Simplify right side
   1,240.69x = 835,980.77
5. Step 5: Solve for x
   x = 835,980.77/1,240.69
6. Step 6: Final answer
   x = 673.80