Finding the Fourth Proportional to 1,921.09, 2,650.78 and 1,081.69

Step by Step Solution

1. Step 1: Write the proportion equation
   1,921.09 : 2,650.78 = 1,081.69 : x
2. Step 2: Convert to fraction form
   1,921.09/2,650.78 = 1,081.69/x
3. Step 3: Cross multiply
   1,921.09x = 2,650.78 × 1,081.69
4. Step 4: Simplify right side
   1,921.09x = 2,867,322.22
5. Step 5: Solve for x
   x = 2,867,322.22/1,921.09
6. Step 6: Final answer
   x = 1,492.55