Finding the Fourth Proportional to 10,991.40, 16,488.18 and 3,200.28

Step by Step Solution

1. Step 1: Write the proportion equation
   10,991.40 : 16,488.18 = 3,200.28 : x
2. Step 2: Convert to fraction form
   10,991.40/16,488.18 = 3,200.28/x
3. Step 3: Cross multiply
   10,991.40x = 16,488.18 × 3,200.28
4. Step 4: Simplify right side
   10,991.40x = 52,766,792.69
5. Step 5: Solve for x
   x = 52,766,792.69/10,991.40
6. Step 6: Final answer
   x = 4,800.73