Finding the Fourth Proportional to 2,508.85, 3,462.15 and 1,389.79

Step by Step Solution

1. Step 1: Write the proportion equation
   2,508.85 : 3,462.15 = 1,389.79 : x
2. Step 2: Convert to fraction form
   2,508.85/3,462.15 = 1,389.79/x
3. Step 3: Cross multiply
   2,508.85x = 3,462.15 × 1,389.79
4. Step 4: Simplify right side
   2,508.85x = 4,811,661.45
5. Step 5: Solve for x
   x = 4,811,661.45/2,508.85
6. Step 6: Final answer
   x = 1,917.88