Finding the Fourth Proportional to 1,659.56, 2,290.02 and 960.80

Step by Step Solution

1. Step 1: Write the proportion equation
   1,659.56 : 2,290.02 = 960.80 : x
2. Step 2: Convert to fraction form
   1,659.56/2,290.02 = 960.80/x
3. Step 3: Cross multiply
   1,659.56x = 2,290.02 × 960.80
4. Step 4: Simplify right side
   1,659.56x = 2,200,251.22
5. Step 5: Solve for x
   x = 2,200,251.22/1,659.56
6. Step 6: Final answer
   x = 1,325.80