Finding the Fourth Proportional to 8,111.52, 12,169.18 and 3,431.95

Step by Step Solution

1. Step 1: Write the proportion equation
   8,111.52 : 12,169.18 = 3,431.95 : x
2. Step 2: Convert to fraction form
   8,111.52/12,169.18 = 3,431.95/x
3. Step 3: Cross multiply
   8,111.52x = 12,169.18 × 3,431.95
4. Step 4: Simplify right side
   8,111.52x = 41,764,017.30
5. Step 5: Solve for x
   x = 41,764,017.30/8,111.52
6. Step 6: Final answer
   x = 5,148.73