Finding the Fourth Proportional to 2,455.42, 3,679.55 and 1,139.57

Step by Step Solution

1. Step 1: Write the proportion equation
   2,455.42 : 3,679.55 = 1,139.57 : x
2. Step 2: Convert to fraction form
   2,455.42/3,679.55 = 1,139.57/x
3. Step 3: Cross multiply
   2,455.42x = 3,679.55 × 1,139.57
4. Step 4: Simplify right side
   2,455.42x = 4,193,108.29
5. Step 5: Solve for x
   x = 4,193,108.29/2,455.42
6. Step 6: Final answer
   x = 1,707.70