Finding the Fourth Proportional to 789.65, 1,086.72 and 769.31

Step by Step Solution

1. Step 1: Write the proportion equation
   789.65 : 1,086.72 = 769.31 : x
2. Step 2: Convert to fraction form
   789.65/1,086.72 = 769.31/x
3. Step 3: Cross multiply
   789.65x = 1,086.72 × 769.31
4. Step 4: Simplify right side
   789.65x = 836,024.56
5. Step 5: Solve for x
   x = 836,024.56/789.65
6. Step 6: Final answer
   x = 1,058.73