Finding the Fourth Proportional to 2,508.57, 3,461.67 and 1,389.56

Step by Step Solution

1. Step 1: Write the proportion equation
   2,508.57 : 3,461.67 = 1,389.56 : x
2. Step 2: Convert to fraction form
   2,508.57/3,461.67 = 1,389.56/x
3. Step 3: Cross multiply
   2,508.57x = 3,461.67 × 1,389.56
4. Step 4: Simplify right side
   2,508.57x = 4,810,180.86
5. Step 5: Solve for x
   x = 4,810,180.86/2,508.57
6. Step 6: Final answer
   x = 1,917.50