Finding the Fourth Proportional to 2,082.30, 3,123.86 and 621.42

Step by Step Solution

1. Step 1: Write the proportion equation
   2,082.30 : 3,123.86 = 621.42 : x
2. Step 2: Convert to fraction form
   2,082.30/3,123.86 = 621.42/x
3. Step 3: Cross multiply
   2,082.30x = 3,123.86 × 621.42
4. Step 4: Simplify right side
   2,082.30x = 1,941,229.08
5. Step 5: Solve for x
   x = 1,941,229.08/2,082.30
6. Step 6: Final answer
   x = 932.25