Finding the Fourth Proportional to 1,921.16, 2,651.32 and 1,081.78

Step by Step Solution

1. Step 1: Write the proportion equation
   1,921.16 : 2,651.32 = 1,081.78 : x
2. Step 2: Convert to fraction form
   1,921.16/2,651.32 = 1,081.78/x
3. Step 3: Cross multiply
   1,921.16x = 2,651.32 × 1,081.78
4. Step 4: Simplify right side
   1,921.16x = 2,868,145.61
5. Step 5: Solve for x
   x = 2,868,145.61/1,921.16
6. Step 6: Final answer
   x = 1,492.93