Finding the Fourth Proportional to 2,082.78, 3,122.78 and 849.86

Step by Step Solution

1. Step 1: Write the proportion equation
   2,082.78 : 3,122.78 = 849.86 : x
2. Step 2: Convert to fraction form
   2,082.78/3,122.78 = 849.86/x
3. Step 3: Cross multiply
   2,082.78x = 3,122.78 × 849.86
4. Step 4: Simplify right side
   2,082.78x = 2,653,925.81
5. Step 5: Solve for x
   x = 2,653,925.81/2,082.78
6. Step 6: Final answer
   x = 1,274.22