Finding the Fourth Proportional to 2,082.78, 3,123.90 and 695.79

Step by Step Solution

1. Step 1: Write the proportion equation
   2,082.78 : 3,123.90 = 695.79 : x
2. Step 2: Convert to fraction form
   2,082.78/3,123.90 = 695.79/x
3. Step 3: Cross multiply
   2,082.78x = 3,123.90 × 695.79
4. Step 4: Simplify right side
   2,082.78x = 2,173,578.38
5. Step 5: Solve for x
   x = 2,173,578.38/2,082.78
6. Step 6: Final answer
   x = 1,043.59