Finding the Fourth Proportional to 2,613.34, 3,920.38 and 764.60

Step by Step Solution

1. Step 1: Write the proportion equation
   2,613.34 : 3,920.38 = 764.60 : x
2. Step 2: Convert to fraction form
   2,613.34/3,920.38 = 764.60/x
3. Step 3: Cross multiply
   2,613.34x = 3,920.38 × 764.60
4. Step 4: Simplify right side
   2,613.34x = 2,997,522.55
5. Step 5: Solve for x
   x = 2,997,522.55/2,613.34
6. Step 6: Final answer
   x = 1,147.01