Finding the Fourth Proportional to 1,920.66, 2,650.52 and 1,081.38

Step by Step Solution

1. Step 1: Write the proportion equation
   1,920.66 : 2,650.52 = 1,081.38 : x
2. Step 2: Convert to fraction form
   1,920.66/2,650.52 = 1,081.38/x
3. Step 3: Cross multiply
   1,920.66x = 2,650.52 × 1,081.38
4. Step 4: Simplify right side
   1,920.66x = 2,866,219.32
5. Step 5: Solve for x
   x = 2,866,219.32/1,920.66
6. Step 6: Final answer
   x = 1,492.31