Finding the Fourth Proportional to 10,991.72, 16,485.98 and 3,198.44

Step by Step Solution

1. Step 1: Write the proportion equation
   10,991.72 : 16,485.98 = 3,198.44 : x
2. Step 2: Convert to fraction form
   10,991.72/16,485.98 = 3,198.44/x
3. Step 3: Cross multiply
   10,991.72x = 16,485.98 × 3,198.44
4. Step 4: Simplify right side
   10,991.72x = 52,729,417.87
5. Step 5: Solve for x
   x = 52,729,417.87/10,991.72
6. Step 6: Final answer
   x = 4,797.19