Finding the Fourth Proportional to 1,921.47, 2,651.55 and 1,082.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,921.47 : 2,651.55 = 1,082.31 : x
2. Step 2: Convert to fraction form
   1,921.47/2,651.55 = 1,082.31/x
3. Step 3: Cross multiply
   1,921.47x = 2,651.55 × 1,082.31
4. Step 4: Simplify right side
   1,921.47x = 2,869,799.08
5. Step 5: Solve for x
   x = 2,869,799.08/1,921.47
6. Step 6: Final answer
   x = 1,493.54