Finding the Fourth Proportional to 2,145.30, 3,217.27 and 1,105.17

Step by Step Solution

1. Step 1: Write the proportion equation
   2,145.30 : 3,217.27 = 1,105.17 : x
2. Step 2: Convert to fraction form
   2,145.30/3,217.27 = 1,105.17/x
3. Step 3: Cross multiply
   2,145.30x = 3,217.27 × 1,105.17
4. Step 4: Simplify right side
   2,145.30x = 3,555,627.52
5. Step 5: Solve for x
   x = 3,555,627.52/2,145.30
6. Step 6: Final answer
   x = 1,657.40