Finding the Fourth Proportional to 2,539.35, 3,808.72 and 1,078.31

Step by Step Solution

1. Step 1: Write the proportion equation
   2,539.35 : 3,808.72 = 1,078.31 : x
2. Step 2: Convert to fraction form
   2,539.35/3,808.72 = 1,078.31/x
3. Step 3: Cross multiply
   2,539.35x = 3,808.72 × 1,078.31
4. Step 4: Simplify right side
   2,539.35x = 4,106,991.73
5. Step 5: Solve for x
   x = 4,106,991.73/2,539.35
6. Step 6: Final answer
   x = 1,617.34