Finding the Fourth Proportional to 2,629.82, 3,938.58 and 2,078.30

Step by Step Solution

1. Step 1: Write the proportion equation
   2,629.82 : 3,938.58 = 2,078.30 : x
2. Step 2: Convert to fraction form
   2,629.82/3,938.58 = 2,078.30/x
3. Step 3: Cross multiply
   2,629.82x = 3,938.58 × 2,078.30
4. Step 4: Simplify right side
   2,629.82x = 8,185,550.81
5. Step 5: Solve for x
   x = 8,185,550.81/2,629.82
6. Step 6: Final answer
   x = 3,112.59