Finding the Fourth Proportional to 2,081.78, 3,123.12 and 694.86

Step by Step Solution

1. Step 1: Write the proportion equation
   2,081.78 : 3,123.12 = 694.86 : x
2. Step 2: Convert to fraction form
   2,081.78/3,123.12 = 694.86/x
3. Step 3: Cross multiply
   2,081.78x = 3,123.12 × 694.86
4. Step 4: Simplify right side
   2,081.78x = 2,170,131.16
5. Step 5: Solve for x
   x = 2,170,131.16/2,081.78
6. Step 6: Final answer
   x = 1,042.44