Finding the Fourth Proportional to 2,082.10, 3,123.45 and 621.06

Step by Step Solution

1. Step 1: Write the proportion equation
   2,082.10 : 3,123.45 = 621.06 : x
2. Step 2: Convert to fraction form
   2,082.10/3,123.45 = 621.06/x
3. Step 3: Cross multiply
   2,082.10x = 3,123.45 × 621.06
4. Step 4: Simplify right side
   2,082.10x = 1,939,849.86
5. Step 5: Solve for x
   x = 1,939,849.86/2,082.10
6. Step 6: Final answer
   x = 931.68