Finding the Fourth Proportional to 10,991.32, 16,497.78 and 8,061.28

Step by Step Solution

1. Step 1: Write the proportion equation
   10,991.32 : 16,497.78 = 8,061.28 : x
2. Step 2: Convert to fraction form
   10,991.32/16,497.78 = 8,061.28/x
3. Step 3: Cross multiply
   10,991.32x = 16,497.78 × 8,061.28
4. Step 4: Simplify right side
   10,991.32x = 132,993,223.96
5. Step 5: Solve for x
   x = 132,993,223.96/10,991.32
6. Step 6: Final answer
   x = 12,099.84