Finding the Fourth Proportional to 1,078.65, 1,617.57 and 493.83

Step by Step Solution

1. Step 1: Write the proportion equation
   1,078.65 : 1,617.57 = 493.83 : x
2. Step 2: Convert to fraction form
   1,078.65/1,617.57 = 493.83/x
3. Step 3: Cross multiply
   1,078.65x = 1,617.57 × 493.83
4. Step 4: Simplify right side
   1,078.65x = 798,804.59
5. Step 5: Solve for x
   x = 798,804.59/1,078.65
6. Step 6: Final answer
   x = 740.56