Finding the Fourth Proportional to 8,109.87, 12,166.05 and 3,429.89

Step by Step Solution

1. Step 1: Write the proportion equation
   8,109.87 : 12,166.05 = 3,429.89 : x
2. Step 2: Convert to fraction form
   8,109.87/12,166.05 = 3,429.89/x
3. Step 3: Cross multiply
   8,109.87x = 12,166.05 × 3,429.89
4. Step 4: Simplify right side
   8,109.87x = 41,728,152.40
5. Step 5: Solve for x
   x = 41,728,152.40/8,109.87
6. Step 6: Final answer
   x = 5,145.35