Finding the Fourth Proportional to 12,815.29, 19,188.51 and 12,078.28

Step by Step Solution

1. Step 1: Write the proportion equation
   12,815.29 : 19,188.51 = 12,078.28 : x
2. Step 2: Convert to fraction form
   12,815.29/19,188.51 = 12,078.28/x
3. Step 3: Cross multiply
   12,815.29x = 19,188.51 × 12,078.28
4. Step 4: Simplify right side
   12,815.29x = 231,764,196.56
5. Step 5: Solve for x
   x = 231,764,196.56/12,815.29
6. Step 6: Final answer
   x = 18,084.97