Finding the Fourth Proportional to 8,340.30, 12,510.18 and 3,408.62

Step by Step Solution

1. Step 1: Write the proportion equation
   8,340.30 : 12,510.18 = 3,408.62 : x
2. Step 2: Convert to fraction form
   8,340.30/12,510.18 = 3,408.62/x
3. Step 3: Cross multiply
   8,340.30x = 12,510.18 × 3,408.62
4. Step 4: Simplify right side
   8,340.30x = 42,642,387.20
5. Step 5: Solve for x
   x = 42,642,387.20/8,340.30
6. Step 6: Final answer
   x = 5,112.81