Finding the Fourth Proportional to 2,558.72, 3,835.31 and 1,239.68

Step by Step Solution

1. Step 1: Write the proportion equation
   2,558.72 : 3,835.31 = 1,239.68 : x
2. Step 2: Convert to fraction form
   2,558.72/3,835.31 = 1,239.68/x
3. Step 3: Cross multiply
   2,558.72x = 3,835.31 × 1,239.68
4. Step 4: Simplify right side
   2,558.72x = 4,754,557.10
5. Step 5: Solve for x
   x = 4,754,557.10/2,558.72
6. Step 6: Final answer
   x = 1,858.18