Finding the Fourth Proportional to 1,920.75, 2,650.69 and 1,081.42

Step by Step Solution

1. Step 1: Write the proportion equation
   1,920.75 : 2,650.69 = 1,081.42 : x
2. Step 2: Convert to fraction form
   1,920.75/2,650.69 = 1,081.42/x
3. Step 3: Cross multiply
   1,920.75x = 2,650.69 × 1,081.42
4. Step 4: Simplify right side
   1,920.75x = 2,866,503.90
5. Step 5: Solve for x
   x = 2,866,503.90/1,920.75
6. Step 6: Final answer
   x = 1,492.39