Finding the Fourth Proportional to 12,196.20, 18,293.34 and 3,431.40

Step by Step Solution

1. Step 1: Write the proportion equation
   12,196.20 : 18,293.34 = 3,431.40 : x
2. Step 2: Convert to fraction form
   12,196.20/18,293.34 = 3,431.40/x
3. Step 3: Cross multiply
   12,196.20x = 18,293.34 × 3,431.40
4. Step 4: Simplify right side
   12,196.20x = 62,771,766.88
5. Step 5: Solve for x
   x = 62,771,766.88/12,196.20
6. Step 6: Final answer
   x = 5,146.83