Finding the Fourth Proportional to 2,609.00, 3,913.52 and 661.22

Step by Step Solution

1. Step 1: Write the proportion equation
   2,609.00 : 3,913.52 = 661.22 : x
2. Step 2: Convert to fraction form
   2,609.00/3,913.52 = 661.22/x
3. Step 3: Cross multiply
   2,609.00x = 3,913.52 × 661.22
4. Step 4: Simplify right side
   2,609.00x = 2,587,679.78
5. Step 5: Solve for x
   x = 2,587,679.78/2,609.00
6. Step 6: Final answer
   x = 991.83