Finding the Fourth Proportional to 2,598.78, 3,899.34 and 1,138.35

Step by Step Solution

1. Step 1: Write the proportion equation
   2,598.78 : 3,899.34 = 1,138.35 : x
2. Step 2: Convert to fraction form
   2,598.78/3,899.34 = 1,138.35/x
3. Step 3: Cross multiply
   2,598.78x = 3,899.34 × 1,138.35
4. Step 4: Simplify right side
   2,598.78x = 4,438,813.69
5. Step 5: Solve for x
   x = 4,438,813.69/2,598.78
6. Step 6: Final answer
   x = 1,708.04