Finding the Fourth Proportional to 10,989.80, 16,487.52 and 3,198.62

Step by Step Solution

1. Step 1: Write the proportion equation
   10,989.80 : 16,487.52 = 3,198.62 : x
2. Step 2: Convert to fraction form
   10,989.80/16,487.52 = 3,198.62/x
3. Step 3: Cross multiply
   10,989.80x = 16,487.52 × 3,198.62
4. Step 4: Simplify right side
   10,989.80x = 52,737,311.22
5. Step 5: Solve for x
   x = 52,737,311.22/10,989.80
6. Step 6: Final answer
   x = 4,798.75