Finding the Fourth Proportional to 2,145.32, 3,217.02 and 1,105.90

Step by Step Solution

1. Step 1: Write the proportion equation
   2,145.32 : 3,217.02 = 1,105.90 : x
2. Step 2: Convert to fraction form
   2,145.32/3,217.02 = 1,105.90/x
3. Step 3: Cross multiply
   2,145.32x = 3,217.02 × 1,105.90
4. Step 4: Simplify right side
   2,145.32x = 3,557,702.42
5. Step 5: Solve for x
   x = 3,557,702.42/2,145.32
6. Step 6: Final answer
   x = 1,658.36