Finding the Fourth Proportional to 1,123.28, 1,682.60 and 659.65

Step by Step Solution

1. Step 1: Write the proportion equation
   1,123.28 : 1,682.60 = 659.65 : x
2. Step 2: Convert to fraction form
   1,123.28/1,682.60 = 659.65/x
3. Step 3: Cross multiply
   1,123.28x = 1,682.60 × 659.65
4. Step 4: Simplify right side
   1,123.28x = 1,109,915.38
5. Step 5: Solve for x
   x = 1,109,915.38/1,123.28
6. Step 6: Final answer
   x = 988.11