Finding the Fourth Proportional to 8,578.50, 12,868.50 and 2,422.50

Step by Step Solution

1. Step 1: Write the proportion equation
   8,578.50 : 12,868.50 = 2,422.50 : x
2. Step 2: Convert to fraction form
   8,578.50/12,868.50 = 2,422.50/x
3. Step 3: Cross multiply
   8,578.50x = 12,868.50 × 2,422.50
4. Step 4: Simplify right side
   8,578.50x = 31,173,941.25
5. Step 5: Solve for x
   x = 31,173,941.25/8,578.50
6. Step 6: Final answer
   x = 3,633.96