Finding the Fourth Proportional to 2,616.52, 3,924.88 and 861.52

Step by Step Solution

1. Step 1: Write the proportion equation
   2,616.52 : 3,924.88 = 861.52 : x
2. Step 2: Convert to fraction form
   2,616.52/3,924.88 = 861.52/x
3. Step 3: Cross multiply
   2,616.52x = 3,924.88 × 861.52
4. Step 4: Simplify right side
   2,616.52x = 3,381,362.62
5. Step 5: Solve for x
   x = 3,381,362.62/2,616.52
6. Step 6: Final answer
   x = 1,292.31