Finding the Fourth Proportional to 10,989.20, 16,472.18 and 3,591.68

Step by Step Solution

1. Step 1: Write the proportion equation
   10,989.20 : 16,472.18 = 3,591.68 : x
2. Step 2: Convert to fraction form
   10,989.20/16,472.18 = 3,591.68/x
3. Step 3: Cross multiply
   10,989.20x = 16,472.18 × 3,591.68
4. Step 4: Simplify right side
   10,989.20x = 59,162,799.46
5. Step 5: Solve for x
   x = 59,162,799.46/10,989.20
6. Step 6: Final answer
   x = 5,383.72