Finding the Fourth Proportional to 10,978.27, 16,469.87 and 5,131.69

Step by Step Solution

1. Step 1: Write the proportion equation
   10,978.27 : 16,469.87 = 5,131.69 : x
2. Step 2: Convert to fraction form
   10,978.27/16,469.87 = 5,131.69/x
3. Step 3: Cross multiply
   10,978.27x = 16,469.87 × 5,131.69
4. Step 4: Simplify right side
   10,978.27x = 84,518,200.35
5. Step 5: Solve for x
   x = 84,518,200.35/10,978.27
6. Step 6: Final answer
   x = 7,698.68