Finding the Fourth Proportional to 11,856.05, 16,363.61 and 7,815.78

Step by Step Solution

1. Step 1: Write the proportion equation
   11,856.05 : 16,363.61 = 7,815.78 : x
2. Step 2: Convert to fraction form
   11,856.05/16,363.61 = 7,815.78/x
3. Step 3: Cross multiply
   11,856.05x = 16,363.61 × 7,815.78
4. Step 4: Simplify right side
   11,856.05x = 127,894,336.69
5. Step 5: Solve for x
   x = 127,894,336.69/11,856.05
6. Step 6: Final answer
   x = 10,787.27