Finding the Fourth Proportional to 2,712.96, 4,069.58 and 765.31

Step by Step Solution

1. Step 1: Write the proportion equation
   2,712.96 : 4,069.58 = 765.31 : x
2. Step 2: Convert to fraction form
   2,712.96/4,069.58 = 765.31/x
3. Step 3: Cross multiply
   2,712.96x = 4,069.58 × 765.31
4. Step 4: Simplify right side
   2,712.96x = 3,114,490.27
5. Step 5: Solve for x
   x = 3,114,490.27/2,712.96
6. Step 6: Final answer
   x = 1,148.00