Finding the Fourth Proportional to 12,787.72, 19,091.87 and 10,819.96

Step by Step Solution

1. Step 1: Write the proportion equation
   12,787.72 : 19,091.87 = 10,819.96 : x
2. Step 2: Convert to fraction form
   12,787.72/19,091.87 = 10,819.96/x
3. Step 3: Cross multiply
   12,787.72x = 19,091.87 × 10,819.96
4. Step 4: Simplify right side
   12,787.72x = 206,573,269.73
5. Step 5: Solve for x
   x = 206,573,269.73/12,787.72
6. Step 6: Final answer
   x = 16,154.03