Finding the Fourth Proportional to 2,606.85, 3,910.28 and 659.05

Step by Step Solution

1. Step 1: Write the proportion equation
   2,606.85 : 3,910.28 = 659.05 : x
2. Step 2: Convert to fraction form
   2,606.85/3,910.28 = 659.05/x
3. Step 3: Cross multiply
   2,606.85x = 3,910.28 × 659.05
4. Step 4: Simplify right side
   2,606.85x = 2,577,076.57
5. Step 5: Solve for x
   x = 2,577,076.57/2,606.85
6. Step 6: Final answer
   x = 988.58