Finding the Fourth Proportional to 2,078.43, 3,118.99 and 1,105.21

Step by Step Solution

1. Step 1: Write the proportion equation
   2,078.43 : 3,118.99 = 1,105.21 : x
2. Step 2: Convert to fraction form
   2,078.43/3,118.99 = 1,105.21/x
3. Step 3: Cross multiply
   2,078.43x = 3,118.99 × 1,105.21
4. Step 4: Simplify right side
   2,078.43x = 3,447,148.12
5. Step 5: Solve for x
   x = 3,447,148.12/2,078.43
6. Step 6: Final answer
   x = 1,658.54