Finding the Fourth Proportional to 839.82, 1,158.12 and 757.78

Step by Step Solution

1. Step 1: Write the proportion equation
   839.82 : 1,158.12 = 757.78 : x
2. Step 2: Convert to fraction form
   839.82/1,158.12 = 757.78/x
3. Step 3: Cross multiply
   839.82x = 1,158.12 × 757.78
4. Step 4: Simplify right side
   839.82x = 877,600.17
5. Step 5: Solve for x
   x = 877,600.17/839.82
6. Step 6: Final answer
   x = 1,044.99