Finding the Fourth Proportional to 2,508.72, 3,461.99 and 1,389.65

Step by Step Solution

1. Step 1: Write the proportion equation
   2,508.72 : 3,461.99 = 1,389.65 : x
2. Step 2: Convert to fraction form
   2,508.72/3,461.99 = 1,389.65/x
3. Step 3: Cross multiply
   2,508.72x = 3,461.99 × 1,389.65
4. Step 4: Simplify right side
   2,508.72x = 4,810,930.15
5. Step 5: Solve for x
   x = 4,810,930.15/2,508.72
6. Step 6: Final answer
   x = 1,917.68