Finding the Fourth Proportional to 2,526.57, 3,786.78 and 1,139.54

Step by Step Solution

1. Step 1: Write the proportion equation
   2,526.57 : 3,786.78 = 1,139.54 : x
2. Step 2: Convert to fraction form
   2,526.57/3,786.78 = 1,139.54/x
3. Step 3: Cross multiply
   2,526.57x = 3,786.78 × 1,139.54
4. Step 4: Simplify right side
   2,526.57x = 4,315,168.35
5. Step 5: Solve for x
   x = 4,315,168.35/2,526.57
6. Step 6: Final answer
   x = 1,707.92