Finding the Fourth Proportional to 2,105.29, 2,905.31 and 1,173.85

Step by Step Solution

1. Step 1: Write the proportion equation
   2,105.29 : 2,905.31 = 1,173.85 : x
2. Step 2: Convert to fraction form
   2,105.29/2,905.31 = 1,173.85/x
3. Step 3: Cross multiply
   2,105.29x = 2,905.31 × 1,173.85
4. Step 4: Simplify right side
   2,105.29x = 3,410,392.27
5. Step 5: Solve for x
   x = 3,410,392.27/2,105.29
6. Step 6: Final answer
   x = 1,619.92