Finding the Fourth Proportional to 2,613.83, 3,921.12 and 765.11

Step by Step Solution

1. Step 1: Write the proportion equation
   2,613.83 : 3,921.12 = 765.11 : x
2. Step 2: Convert to fraction form
   2,613.83/3,921.12 = 765.11/x
3. Step 3: Cross multiply
   2,613.83x = 3,921.12 × 765.11
4. Step 4: Simplify right side
   2,613.83x = 3,000,088.12
5. Step 5: Solve for x
   x = 3,000,088.12/2,613.83
6. Step 6: Final answer
   x = 1,147.77