Finding the Fourth Proportional to 10,991.76, 16,485.60 and 3,198.72

Step by Step Solution

1. Step 1: Write the proportion equation
   10,991.76 : 16,485.60 = 3,198.72 : x
2. Step 2: Convert to fraction form
   10,991.76/16,485.60 = 3,198.72/x
3. Step 3: Cross multiply
   10,991.76x = 16,485.60 × 3,198.72
4. Step 4: Simplify right side
   10,991.76x = 52,732,818.43
5. Step 5: Solve for x
   x = 52,732,818.43/10,991.76
6. Step 6: Final answer
   x = 4,797.49