Finding the Fourth Proportional to 2,613.30, 3,920.22 and 764.45

Step by Step Solution

1. Step 1: Write the proportion equation
   2,613.30 : 3,920.22 = 764.45 : x
2. Step 2: Convert to fraction form
   2,613.30/3,920.22 = 764.45/x
3. Step 3: Cross multiply
   2,613.30x = 3,920.22 × 764.45
4. Step 4: Simplify right side
   2,613.30x = 2,996,821.98
5. Step 5: Solve for x
   x = 2,996,821.98/2,613.30
6. Step 6: Final answer
   x = 1,146.76