Finding the Fourth Proportional to 8,986.49, 12,401.46 and 5,209.86

Step by Step Solution

1. Step 1: Write the proportion equation
   8,986.49 : 12,401.46 = 5,209.86 : x
2. Step 2: Convert to fraction form
   8,986.49/12,401.46 = 5,209.86/x
3. Step 3: Cross multiply
   8,986.49x = 12,401.46 × 5,209.86
4. Step 4: Simplify right side
   8,986.49x = 64,609,870.40
5. Step 5: Solve for x
   x = 64,609,870.40/8,986.49
6. Step 6: Final answer
   x = 7,189.67