Finding the Fourth Proportional to 2,118.65, 2,921.83 and 1,371.83

Step by Step Solution

1. Step 1: Write the proportion equation
   2,118.65 : 2,921.83 = 1,371.83 : x
2. Step 2: Convert to fraction form
   2,118.65/2,921.83 = 1,371.83/x
3. Step 3: Cross multiply
   2,118.65x = 2,921.83 × 1,371.83
4. Step 4: Simplify right side
   2,118.65x = 4,008,254.05
5. Step 5: Solve for x
   x = 4,008,254.05/2,118.65
6. Step 6: Final answer
   x = 1,891.89