Finding the Fourth Proportional to 8,146.87, 12,211.98 and 3,209.71

Step by Step Solution

1. Step 1: Write the proportion equation
   8,146.87 : 12,211.98 = 3,209.71 : x
2. Step 2: Convert to fraction form
   8,146.87/12,211.98 = 3,209.71/x
3. Step 3: Cross multiply
   8,146.87x = 12,211.98 × 3,209.71
4. Step 4: Simplify right side
   8,146.87x = 39,196,914.33
5. Step 5: Solve for x
   x = 39,196,914.33/8,146.87
6. Step 6: Final answer
   x = 4,811.29