Finding the Fourth Proportional to 2,082.15, 3,123.78 and 621.32

Step by Step Solution

1. Step 1: Write the proportion equation
   2,082.15 : 3,123.78 = 621.32 : x
2. Step 2: Convert to fraction form
   2,082.15/3,123.78 = 621.32/x
3. Step 3: Cross multiply
   2,082.15x = 3,123.78 × 621.32
4. Step 4: Simplify right side
   2,082.15x = 1,940,851.37
5. Step 5: Solve for x
   x = 1,940,851.37/2,082.15
6. Step 6: Final answer
   x = 932.14