Finding the Fourth Proportional to 1,920.68, 2,650.69 and 1,081.59

Step by Step Solution

1. Step 1: Write the proportion equation
   1,920.68 : 2,650.69 = 1,081.59 : x
2. Step 2: Convert to fraction form
   1,920.68/2,650.69 = 1,081.59/x
3. Step 3: Cross multiply
   1,920.68x = 2,650.69 × 1,081.59
4. Step 4: Simplify right side
   1,920.68x = 2,866,959.80
5. Step 5: Solve for x
   x = 2,866,959.80/1,920.68
6. Step 6: Final answer
   x = 1,492.68