Finding the Fourth Proportional to 12,665.16, 18,995.52 and 3,429

Step by Step Solution

1. Step 1: Write the proportion equation
   12,665.16 : 18,995.52 = 3,429 : x
2. Step 2: Convert to fraction form
   12,665.16/18,995.52 = 3,429/x
3. Step 3: Cross multiply
   12,665.16x = 18,995.52 × 3,429
4. Step 4: Simplify right side
   12,665.16x = 65,135,638.08
5. Step 5: Solve for x
   x = 65,135,638.08/12,665.16
6. Step 6: Final answer
   x = 5,142.90