Finding the Fourth Proportional to 1,158.15, 1,597.89 and 660.76

Step by Step Solution

1. Step 1: Write the proportion equation
   1,158.15 : 1,597.89 = 660.76 : x
2. Step 2: Convert to fraction form
   1,158.15/1,597.89 = 660.76/x
3. Step 3: Cross multiply
   1,158.15x = 1,597.89 × 660.76
4. Step 4: Simplify right side
   1,158.15x = 1,055,820.28
5. Step 5: Solve for x
   x = 1,055,820.28/1,158.15
6. Step 6: Final answer
   x = 911.65