Finding the Fourth Proportional to 2,598.57, 3,899.21 and 1,138.05

Step by Step Solution

1. Step 1: Write the proportion equation
   2,598.57 : 3,899.21 = 1,138.05 : x
2. Step 2: Convert to fraction form
   2,598.57/3,899.21 = 1,138.05/x
3. Step 3: Cross multiply
   2,598.57x = 3,899.21 × 1,138.05
4. Step 4: Simplify right side
   2,598.57x = 4,437,490.25
5. Step 5: Solve for x
   x = 4,437,490.25/2,598.57
6. Step 6: Final answer
   x = 1,707.67