Finding the Fourth Proportional to 1,158.16, 1,597.91 and 716.20

Step by Step Solution

1. Step 1: Write the proportion equation
   1,158.16 : 1,597.91 = 716.20 : x
2. Step 2: Convert to fraction form
   1,158.16/1,597.91 = 716.20/x
3. Step 3: Cross multiply
   1,158.16x = 1,597.91 × 716.20
4. Step 4: Simplify right side
   1,158.16x = 1,144,433.85
5. Step 5: Solve for x
   x = 1,144,433.85/1,158.16
6. Step 6: Final answer
   x = 988.15