Finding the Fourth Proportional to 12,787.12, 19,178.72 and 3,427.76

Step by Step Solution

1. Step 1: Write the proportion equation
   12,787.12 : 19,178.72 = 3,427.76 : x
2. Step 2: Convert to fraction form
   12,787.12/19,178.72 = 3,427.76/x
3. Step 3: Cross multiply
   12,787.12x = 19,178.72 × 3,427.76
4. Step 4: Simplify right side
   12,787.12x = 65,740,049.27
5. Step 5: Solve for x
   x = 65,740,049.27/12,787.12
6. Step 6: Final answer
   x = 5,141.11