Finding the Fourth Proportional to 1,920.85, 2,650.84 and 1,081.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,920.85 : 2,650.84 = 1,081.72 : x
2. Step 2: Convert to fraction form
   1,920.85/2,650.84 = 1,081.72/x
3. Step 3: Cross multiply
   1,920.85x = 2,650.84 × 1,081.72
4. Step 4: Simplify right side
   1,920.85x = 2,867,466.64
5. Step 5: Solve for x
   x = 2,867,466.64/1,920.85
6. Step 6: Final answer
   x = 1,492.81