Finding the Fourth Proportional to 1,388.27, 2,081.83 and 694.11

Step by Step Solution

1. Step 1: Write the proportion equation
   1,388.27 : 2,081.83 = 694.11 : x
2. Step 2: Convert to fraction form
   1,388.27/2,081.83 = 694.11/x
3. Step 3: Cross multiply
   1,388.27x = 2,081.83 × 694.11
4. Step 4: Simplify right side
   1,388.27x = 1,445,019.02
5. Step 5: Solve for x
   x = 1,445,019.02/1,388.27
6. Step 6: Final answer
   x = 1,040.88