Finding the Fourth Proportional to 2,112.05, 3,168.68 and 1,330.80

Step by Step Solution

1. Step 1: Write the proportion equation
   2,112.05 : 3,168.68 = 1,330.80 : x
2. Step 2: Convert to fraction form
   2,112.05/3,168.68 = 1,330.80/x
3. Step 3: Cross multiply
   2,112.05x = 3,168.68 × 1,330.80
4. Step 4: Simplify right side
   2,112.05x = 4,216,872.69
5. Step 5: Solve for x
   x = 4,216,872.69/2,112.05
6. Step 6: Final answer
   x = 1,996.58