Finding the Fourth Proportional to 2,613.48, 3,919.31 and 764.55

Step by Step Solution

1. Step 1: Write the proportion equation
   2,613.48 : 3,919.31 = 764.55 : x
2. Step 2: Convert to fraction form
   2,613.48/3,919.31 = 764.55/x
3. Step 3: Cross multiply
   2,613.48x = 3,919.31 × 764.55
4. Step 4: Simplify right side
   2,613.48x = 2,996,504.64
5. Step 5: Solve for x
   x = 2,996,504.64/2,613.48
6. Step 6: Final answer
   x = 1,146.56