Finding the Fourth Proportional to 2,424.61, 3,636.78 and 864.55

Step by Step Solution

1. Step 1: Write the proportion equation
   2,424.61 : 3,636.78 = 864.55 : x
2. Step 2: Convert to fraction form
   2,424.61/3,636.78 = 864.55/x
3. Step 3: Cross multiply
   2,424.61x = 3,636.78 × 864.55
4. Step 4: Simplify right side
   2,424.61x = 3,144,178.15
5. Step 5: Solve for x
   x = 3,144,178.15/2,424.61
6. Step 6: Final answer
   x = 1,296.78