Finding the Fourth Proportional to 2,039.78, 2,793.81 and 1,920.10

Step by Step Solution

1. Step 1: Write the proportion equation
   2,039.78 : 2,793.81 = 1,920.10 : x
2. Step 2: Convert to fraction form
   2,039.78/2,793.81 = 1,920.10/x
3. Step 3: Cross multiply
   2,039.78x = 2,793.81 × 1,920.10
4. Step 4: Simplify right side
   2,039.78x = 5,364,371.01
5. Step 5: Solve for x
   x = 5,364,371.01/2,039.78
6. Step 6: Final answer
   x = 2,629.88