Finding the Fourth Proportional to 12,099.50, 16,659.12 and 10,992.20

Step by Step Solution

1. Step 1: Write the proportion equation
   12,099.50 : 16,659.12 = 10,992.20 : x
2. Step 2: Convert to fraction form
   12,099.50/16,659.12 = 10,992.20/x
3. Step 3: Cross multiply
   12,099.50x = 16,659.12 × 10,992.20
4. Step 4: Simplify right side
   12,099.50x = 183,120,378.86
5. Step 5: Solve for x
   x = 183,120,378.86/12,099.50
6. Step 6: Final answer
   x = 15,134.54