Finding the Fourth Proportional to 12,855.45, 19,142.70 and 12,382.52

Step by Step Solution

1. Step 1: Write the proportion equation
   12,855.45 : 19,142.70 = 12,382.52 : x
2. Step 2: Convert to fraction form
   12,855.45/19,142.70 = 12,382.52/x
3. Step 3: Cross multiply
   12,855.45x = 19,142.70 × 12,382.52
4. Step 4: Simplify right side
   12,855.45x = 237,034,935.61
5. Step 5: Solve for x
   x = 237,034,935.61/12,855.45
6. Step 6: Final answer
   x = 18,438.48