Finding the Fourth Proportional to 2,138.37, 3,205.47 and 1,098.87

Step by Step Solution

1. Step 1: Write the proportion equation
   2,138.37 : 3,205.47 = 1,098.87 : x
2. Step 2: Convert to fraction form
   2,138.37/3,205.47 = 1,098.87/x
3. Step 3: Cross multiply
   2,138.37x = 3,205.47 × 1,098.87
4. Step 4: Simplify right side
   2,138.37x = 3,522,394.82
5. Step 5: Solve for x
   x = 3,522,394.82/2,138.37
6. Step 6: Final answer
   x = 1,647.23