Finding the Fourth Proportional to 2,557.30, 3,839.55 and 1,308.79

Step by Step Solution

1. Step 1: Write the proportion equation
   2,557.30 : 3,839.55 = 1,308.79 : x
2. Step 2: Convert to fraction form
   2,557.30/3,839.55 = 1,308.79/x
3. Step 3: Cross multiply
   2,557.30x = 3,839.55 × 1,308.79
4. Step 4: Simplify right side
   2,557.30x = 5,025,148.50
5. Step 5: Solve for x
   x = 5,025,148.50/2,557.30
6. Step 6: Final answer
   x = 1,965.02