Finding the Fourth Proportional to 1,921.40, 2,651.43 and 1,082.12

Step by Step Solution

1. Step 1: Write the proportion equation
   1,921.40 : 2,651.43 = 1,082.12 : x
2. Step 2: Convert to fraction form
   1,921.40/2,651.43 = 1,082.12/x
3. Step 3: Cross multiply
   1,921.40x = 2,651.43 × 1,082.12
4. Step 4: Simplify right side
   1,921.40x = 2,869,165.43
5. Step 5: Solve for x
   x = 2,869,165.43/1,921.40
6. Step 6: Final answer
   x = 1,493.27