Finding the Fourth Proportional to 12,162.42, 16,784.21 and 7,688.18

Step by Step Solution

1. Step 1: Write the proportion equation
   12,162.42 : 16,784.21 = 7,688.18 : x
2. Step 2: Convert to fraction form
   12,162.42/16,784.21 = 7,688.18/x
3. Step 3: Cross multiply
   12,162.42x = 16,784.21 × 7,688.18
4. Step 4: Simplify right side
   12,162.42x = 129,040,088.82
5. Step 5: Solve for x
   x = 129,040,088.82/12,162.42
6. Step 6: Final answer
   x = 10,609.74