Finding the Fourth Proportional to 12,142.53, 18,215.51 and 3,819.71

Step by Step Solution

1. Step 1: Write the proportion equation
   12,142.53 : 18,215.51 = 3,819.71 : x
2. Step 2: Convert to fraction form
   12,142.53/18,215.51 = 3,819.71/x
3. Step 3: Cross multiply
   12,142.53x = 18,215.51 × 3,819.71
4. Step 4: Simplify right side
   12,142.53x = 69,577,855.53
5. Step 5: Solve for x
   x = 69,577,855.53/12,142.53
6. Step 6: Final answer
   x = 5,730.10