Finding the Fourth Proportional to 10,917.76, 16,375.72 and 3,520.28

Step by Step Solution

1. Step 1: Write the proportion equation
   10,917.76 : 16,375.72 = 3,520.28 : x
2. Step 2: Convert to fraction form
   10,917.76/16,375.72 = 3,520.28/x
3. Step 3: Cross multiply
   10,917.76x = 16,375.72 × 3,520.28
4. Step 4: Simplify right side
   10,917.76x = 57,647,119.60
5. Step 5: Solve for x
   x = 57,647,119.60/10,917.76
6. Step 6: Final answer
   x = 5,280.12