Finding the Fourth Proportional to 1,965.81, 2,712.69 and 1,081.43

Step by Step Solution

1. Step 1: Write the proportion equation
   1,965.81 : 2,712.69 = 1,081.43 : x
2. Step 2: Convert to fraction form
   1,965.81/2,712.69 = 1,081.43/x
3. Step 3: Cross multiply
   1,965.81x = 2,712.69 × 1,081.43
4. Step 4: Simplify right side
   1,965.81x = 2,933,570.78
5. Step 5: Solve for x
   x = 2,933,570.78/1,965.81
6. Step 6: Final answer
   x = 1,492.30