Finding the Fourth Proportional to 10,991.56, 16,489.98 and 3,200.20

Step by Step Solution

1. Step 1: Write the proportion equation
   10,991.56 : 16,489.98 = 3,200.20 : x
2. Step 2: Convert to fraction form
   10,991.56/16,489.98 = 3,200.20/x
3. Step 3: Cross multiply
   10,991.56x = 16,489.98 × 3,200.20
4. Step 4: Simplify right side
   10,991.56x = 52,771,234.00
5. Step 5: Solve for x
   x = 52,771,234.00/10,991.56
6. Step 6: Final answer
   x = 4,801.07