Finding the Fourth Proportional to 10,078.80, 15,118.16 and 5,490.96

Step by Step Solution

1. Step 1: Write the proportion equation
   10,078.80 : 15,118.16 = 5,490.96 : x
2. Step 2: Convert to fraction form
   10,078.80/15,118.16 = 5,490.96/x
3. Step 3: Cross multiply
   10,078.80x = 15,118.16 × 5,490.96
4. Step 4: Simplify right side
   10,078.80x = 83,013,211.83
5. Step 5: Solve for x
   x = 83,013,211.83/10,078.80
6. Step 6: Final answer
   x = 8,236.42