Finding the Fourth Proportional to 2,036.78, 2,809.67 and 1,289.42

Step by Step Solution

1. Step 1: Write the proportion equation
   2,036.78 : 2,809.67 = 1,289.42 : x
2. Step 2: Convert to fraction form
   2,036.78/2,809.67 = 1,289.42/x
3. Step 3: Cross multiply
   2,036.78x = 2,809.67 × 1,289.42
4. Step 4: Simplify right side
   2,036.78x = 3,622,830.64
5. Step 5: Solve for x
   x = 3,622,830.64/2,036.78
6. Step 6: Final answer
   x = 1,778.71