Finding the Fourth Proportional to 10,981.80, 16,469.60 and 5,438.43

Step by Step Solution

1. Step 1: Write the proportion equation
   10,981.80 : 16,469.60 = 5,438.43 : x
2. Step 2: Convert to fraction form
   10,981.80/16,469.60 = 5,438.43/x
3. Step 3: Cross multiply
   10,981.80x = 16,469.60 × 5,438.43
4. Step 4: Simplify right side
   10,981.80x = 89,568,739.54
5. Step 5: Solve for x
   x = 89,568,739.54/10,981.80
6. Step 6: Final answer
   x = 8,156.11