Finding the Fourth Proportional to 2,508.31, 3,461.55 and 1,389.23

Step by Step Solution

1. Step 1: Write the proportion equation
   2,508.31 : 3,461.55 = 1,389.23 : x
2. Step 2: Convert to fraction form
   2,508.31/3,461.55 = 1,389.23/x
3. Step 3: Cross multiply
   2,508.31x = 3,461.55 × 1,389.23
4. Step 4: Simplify right side
   2,508.31x = 4,808,879.09
5. Step 5: Solve for x
   x = 4,808,879.09/2,508.31
6. Step 6: Final answer
   x = 1,917.18