Finding the Fourth Proportional to 2,180.40, 3,008.72 and 1,296.09

Step by Step Solution

1. Step 1: Write the proportion equation
   2,180.40 : 3,008.72 = 1,296.09 : x
2. Step 2: Convert to fraction form
   2,180.40/3,008.72 = 1,296.09/x
3. Step 3: Cross multiply
   2,180.40x = 3,008.72 × 1,296.09
4. Step 4: Simplify right side
   2,180.40x = 3,899,565.42
5. Step 5: Solve for x
   x = 3,899,565.42/2,180.40
6. Step 6: Final answer
   x = 1,788.46