Finding the Fourth Proportional to 2,616.54, 3,925.55 and 767.61

Step by Step Solution

1. Step 1: Write the proportion equation
   2,616.54 : 3,925.55 = 767.61 : x
2. Step 2: Convert to fraction form
   2,616.54/3,925.55 = 767.61/x
3. Step 3: Cross multiply
   2,616.54x = 3,925.55 × 767.61
4. Step 4: Simplify right side
   2,616.54x = 3,013,308.84
5. Step 5: Solve for x
   x = 3,013,308.84/2,616.54
6. Step 6: Final answer
   x = 1,151.64