Finding the Fourth Proportional to 12,787.57, 17,664.28 and 10,819.27

Step by Step Solution

1. Step 1: Write the proportion equation
   12,787.57 : 17,664.28 = 10,819.27 : x
2. Step 2: Convert to fraction form
   12,787.57/17,664.28 = 10,819.27/x
3. Step 3: Cross multiply
   12,787.57x = 17,664.28 × 10,819.27
4. Step 4: Simplify right side
   12,787.57x = 191,114,609.71
5. Step 5: Solve for x
   x = 191,114,609.71/12,787.57
6. Step 6: Final answer
   x = 14,945.34