Finding the Fourth Proportional to 8,109.05, 12,164.09 and 3,428.19

Step by Step Solution

1. Step 1: Write the proportion equation
   8,109.05 : 12,164.09 = 3,428.19 : x
2. Step 2: Convert to fraction form
   8,109.05/12,164.09 = 3,428.19/x
3. Step 3: Cross multiply
   8,109.05x = 12,164.09 × 3,428.19
4. Step 4: Simplify right side
   8,109.05x = 41,700,820.27
5. Step 5: Solve for x
   x = 41,700,820.27/8,109.05
6. Step 6: Final answer
   x = 5,142.50