Finding the Fourth Proportional to 1,160.49, 1,601.57 and 718.65

Step by Step Solution

1. Step 1: Write the proportion equation
   1,160.49 : 1,601.57 = 718.65 : x
2. Step 2: Convert to fraction form
   1,160.49/1,601.57 = 718.65/x
3. Step 3: Cross multiply
   1,160.49x = 1,601.57 × 718.65
4. Step 4: Simplify right side
   1,160.49x = 1,150,964.69
5. Step 5: Solve for x
   x = 1,150,964.69/1,160.49
6. Step 6: Final answer
   x = 991.79