Finding the Fourth Proportional to 2,059.38, 3,089.57 and 672.78

Step by Step Solution

1. Step 1: Write the proportion equation
   2,059.38 : 3,089.57 = 672.78 : x
2. Step 2: Convert to fraction form
   2,059.38/3,089.57 = 672.78/x
3. Step 3: Cross multiply
   2,059.38x = 3,089.57 × 672.78
4. Step 4: Simplify right side
   2,059.38x = 2,078,600.90
5. Step 5: Solve for x
   x = 2,078,600.90/2,059.38
6. Step 6: Final answer
   x = 1,009.33