Finding the Fourth Proportional to 1,158.69, 1,599.12 and 716.55

Step by Step Solution

1. Step 1: Write the proportion equation
   1,158.69 : 1,599.12 = 716.55 : x
2. Step 2: Convert to fraction form
   1,158.69/1,599.12 = 716.55/x
3. Step 3: Cross multiply
   1,158.69x = 1,599.12 × 716.55
4. Step 4: Simplify right side
   1,158.69x = 1,145,849.44
5. Step 5: Solve for x
   x = 1,145,849.44/1,158.69
6. Step 6: Final answer
   x = 988.92