Finding the Fourth Proportional to 12,080.26, 18,111.62 and 8,121.69

Step by Step Solution

1. Step 1: Write the proportion equation
   12,080.26 : 18,111.62 = 8,121.69 : x
2. Step 2: Convert to fraction form
   12,080.26/18,111.62 = 8,121.69/x
3. Step 3: Cross multiply
   12,080.26x = 18,111.62 × 8,121.69
4. Step 4: Simplify right side
   12,080.26x = 147,096,952.89
5. Step 5: Solve for x
   x = 147,096,952.89/12,080.26
6. Step 6: Final answer
   x = 12,176.64