Finding the Fourth Proportional to 2,082.76, 3,123.86 and 621.64

Step by Step Solution

1. Step 1: Write the proportion equation
   2,082.76 : 3,123.86 = 621.64 : x
2. Step 2: Convert to fraction form
   2,082.76/3,123.86 = 621.64/x
3. Step 3: Cross multiply
   2,082.76x = 3,123.86 × 621.64
4. Step 4: Simplify right side
   2,082.76x = 1,941,916.33
5. Step 5: Solve for x
   x = 1,941,916.33/2,082.76
6. Step 6: Final answer
   x = 932.38