Finding the Fourth Proportional to 2,227.15, 3,340.69 and 766.31

Step by Step Solution

1. Step 1: Write the proportion equation
   2,227.15 : 3,340.69 = 766.31 : x
2. Step 2: Convert to fraction form
   2,227.15/3,340.69 = 766.31/x
3. Step 3: Cross multiply
   2,227.15x = 3,340.69 × 766.31
4. Step 4: Simplify right side
   2,227.15x = 2,560,000.32
5. Step 5: Solve for x
   x = 2,560,000.32/2,227.15
6. Step 6: Final answer
   x = 1,149.45