Finding the Fourth Proportional to 1,921.15, 2,651.11 and 1,081.89

Step by Step Solution

1. Step 1: Write the proportion equation
   1,921.15 : 2,651.11 = 1,081.89 : x
2. Step 2: Convert to fraction form
   1,921.15/2,651.11 = 1,081.89/x
3. Step 3: Cross multiply
   1,921.15x = 2,651.11 × 1,081.89
4. Step 4: Simplify right side
   1,921.15x = 2,868,209.40
5. Step 5: Solve for x
   x = 2,868,209.40/1,921.15
6. Step 6: Final answer
   x = 1,492.96