Finding the Fourth Proportional to 2,673.72, 4,009.98 and 1,286.20

Step by Step Solution

1. Step 1: Write the proportion equation
   2,673.72 : 4,009.98 = 1,286.20 : x
2. Step 2: Convert to fraction form
   2,673.72/4,009.98 = 1,286.20/x
3. Step 3: Cross multiply
   2,673.72x = 4,009.98 × 1,286.20
4. Step 4: Simplify right side
   2,673.72x = 5,157,636.28
5. Step 5: Solve for x
   x = 5,157,636.28/2,673.72
6. Step 6: Final answer
   x = 1,929.01