Finding the Fourth Proportional to 3,117.98, 4,687.91 and 2,609.51

Step by Step Solution

1. Step 1: Write the proportion equation
   3,117.98 : 4,687.91 = 2,609.51 : x
2. Step 2: Convert to fraction form
   3,117.98/4,687.91 = 2,609.51/x
3. Step 3: Cross multiply
   3,117.98x = 4,687.91 × 2,609.51
4. Step 4: Simplify right side
   3,117.98x = 12,233,111.54
5. Step 5: Solve for x
   x = 12,233,111.54/3,117.98
6. Step 6: Final answer
   x = 3,923.42