Finding the Fourth Proportional to 2,613.69, 3,921.15 and 764.76

Step by Step Solution

1. Step 1: Write the proportion equation
   2,613.69 : 3,921.15 = 764.76 : x
2. Step 2: Convert to fraction form
   2,613.69/3,921.15 = 764.76/x
3. Step 3: Cross multiply
   2,613.69x = 3,921.15 × 764.76
4. Step 4: Simplify right side
   2,613.69x = 2,998,738.67
5. Step 5: Solve for x
   x = 2,998,738.67/2,613.69
6. Step 6: Final answer
   x = 1,147.32