Finding the Fourth Proportional to 1,166.69, 1,609.92 and 718.49

Step by Step Solution

1. Step 1: Write the proportion equation
   1,166.69 : 1,609.92 = 718.49 : x
2. Step 2: Convert to fraction form
   1,166.69/1,609.92 = 718.49/x
3. Step 3: Cross multiply
   1,166.69x = 1,609.92 × 718.49
4. Step 4: Simplify right side
   1,166.69x = 1,156,715.45
5. Step 5: Solve for x
   x = 1,156,715.45/1,166.69
6. Step 6: Final answer
   x = 991.45