Finding the Fourth Proportional to 2,081.10, 3,121.78 and 694.56

Step by Step Solution

1. Step 1: Write the proportion equation
   2,081.10 : 3,121.78 = 694.56 : x
2. Step 2: Convert to fraction form
   2,081.10/3,121.78 = 694.56/x
3. Step 3: Cross multiply
   2,081.10x = 3,121.78 × 694.56
4. Step 4: Simplify right side
   2,081.10x = 2,168,263.52
5. Step 5: Solve for x
   x = 2,168,263.52/2,081.10
6. Step 6: Final answer
   x = 1,041.88