Finding the Fourth Proportional to 2,680.66, 4,015.89 and 1,289.89

Step by Step Solution

1. Step 1: Write the proportion equation
   2,680.66 : 4,015.89 = 1,289.89 : x
2. Step 2: Convert to fraction form
   2,680.66/4,015.89 = 1,289.89/x
3. Step 3: Cross multiply
   2,680.66x = 4,015.89 × 1,289.89
4. Step 4: Simplify right side
   2,680.66x = 5,180,056.35
5. Step 5: Solve for x
   x = 5,180,056.35/2,680.66
6. Step 6: Final answer
   x = 1,932.38