Finding the Fourth Proportional to 8,109.05, 12,155.67 and 3,948.89

Step by Step Solution

1. Step 1: Write the proportion equation
   8,109.05 : 12,155.67 = 3,948.89 : x
2. Step 2: Convert to fraction form
   8,109.05/12,155.67 = 3,948.89/x
3. Step 3: Cross multiply
   8,109.05x = 12,155.67 × 3,948.89
4. Step 4: Simplify right side
   8,109.05x = 48,001,342.93
5. Step 5: Solve for x
   x = 48,001,342.93/8,109.05
6. Step 6: Final answer
   x = 5,919.48