Finding the Fourth Proportional to 1,678.73, 2,315.25 and 1,081.35

Step by Step Solution

1. Step 1: Write the proportion equation
   1,678.73 : 2,315.25 = 1,081.35 : x
2. Step 2: Convert to fraction form
   1,678.73/2,315.25 = 1,081.35/x
3. Step 3: Cross multiply
   1,678.73x = 2,315.25 × 1,081.35
4. Step 4: Simplify right side
   1,678.73x = 2,503,595.59
5. Step 5: Solve for x
   x = 2,503,595.59/1,678.73
6. Step 6: Final answer
   x = 1,491.37