Finding the Fourth Proportional to 8,986.39, 12,400.50 and 5,451.55

Step by Step Solution

1. Step 1: Write the proportion equation
   8,986.39 : 12,400.50 = 5,451.55 : x
2. Step 2: Convert to fraction form
   8,986.39/12,400.50 = 5,451.55/x
3. Step 3: Cross multiply
   8,986.39x = 12,400.50 × 5,451.55
4. Step 4: Simplify right side
   8,986.39x = 67,601,945.78
5. Step 5: Solve for x
   x = 67,601,945.78/8,986.39
6. Step 6: Final answer
   x = 7,522.70