Finding the Fourth Proportional to 2,009.20, 3,014.88 and 1,279.12

Step by Step Solution

1. Step 1: Write the proportion equation
   2,009.20 : 3,014.88 = 1,279.12 : x
2. Step 2: Convert to fraction form
   2,009.20/3,014.88 = 1,279.12/x
3. Step 3: Cross multiply
   2,009.20x = 3,014.88 × 1,279.12
4. Step 4: Simplify right side
   2,009.20x = 3,856,393.31
5. Step 5: Solve for x
   x = 3,856,393.31/2,009.20
6. Step 6: Final answer
   x = 1,919.37