Finding the Fourth Proportional to 2,609.28, 3,910.14 and 1,308.96

Step by Step Solution

1. Step 1: Write the proportion equation
   2,609.28 : 3,910.14 = 1,308.96 : x
2. Step 2: Convert to fraction form
   2,609.28/3,910.14 = 1,308.96/x
3. Step 3: Cross multiply
   2,609.28x = 3,910.14 × 1,308.96
4. Step 4: Simplify right side
   2,609.28x = 5,118,216.85
5. Step 5: Solve for x
   x = 5,118,216.85/2,609.28
6. Step 6: Final answer
   x = 1,961.54