Finding the Fourth Proportional to 1,659.42, 2,289.90 and 960.78

Step by Step Solution

1. Step 1: Write the proportion equation
   1,659.42 : 2,289.90 = 960.78 : x
2. Step 2: Convert to fraction form
   1,659.42/2,289.90 = 960.78/x
3. Step 3: Cross multiply
   1,659.42x = 2,289.90 × 960.78
4. Step 4: Simplify right side
   1,659.42x = 2,200,090.12
5. Step 5: Solve for x
   x = 2,200,090.12/1,659.42
6. Step 6: Final answer
   x = 1,325.82