Finding the Fourth Proportional to 2,606.40, 3,906.72 and 2,059.20

Step by Step Solution

1. Step 1: Write the proportion equation
   2,606.40 : 3,906.72 = 2,059.20 : x
2. Step 2: Convert to fraction form
   2,606.40/3,906.72 = 2,059.20/x
3. Step 3: Cross multiply
   2,606.40x = 3,906.72 × 2,059.20
4. Step 4: Simplify right side
   2,606.40x = 8,044,717.82
5. Step 5: Solve for x
   x = 8,044,717.82/2,606.40
6. Step 6: Final answer
   x = 3,086.52