Finding the Fourth Proportional to 2,606.81, 3,909.75 and 1,290.14

Step by Step Solution

1. Step 1: Write the proportion equation
   2,606.81 : 3,909.75 = 1,290.14 : x
2. Step 2: Convert to fraction form
   2,606.81/3,909.75 = 1,290.14/x
3. Step 3: Cross multiply
   2,606.81x = 3,909.75 × 1,290.14
4. Step 4: Simplify right side
   2,606.81x = 5,044,124.87
5. Step 5: Solve for x
   x = 5,044,124.87/2,606.81
6. Step 6: Final answer
   x = 1,934.98