Finding the Fourth Proportional to 10,878, 16,318.17 and 3,480.72

Step by Step Solution

1. Step 1: Write the proportion equation
   10,878 : 16,318.17 = 3,480.72 : x
2. Step 2: Convert to fraction form
   10,878/16,318.17 = 3,480.72/x
3. Step 3: Cross multiply
   10,878x = 16,318.17 × 3,480.72
4. Step 4: Simplify right side
   10,878x = 56,798,980.68
5. Step 5: Solve for x
   x = 56,798,980.68/10,878
6. Step 6: Final answer
   x = 5,221.45