Finding the Fourth Proportional to 2,105.87, 3,158.82 and 1,245.65

Step by Step Solution

1. Step 1: Write the proportion equation
   2,105.87 : 3,158.82 = 1,245.65 : x
2. Step 2: Convert to fraction form
   2,105.87/3,158.82 = 1,245.65/x
3. Step 3: Cross multiply
   2,105.87x = 3,158.82 × 1,245.65
4. Step 4: Simplify right side
   2,105.87x = 3,934,768.34
5. Step 5: Solve for x
   x = 3,934,768.34/2,105.87
6. Step 6: Final answer
   x = 1,868.48