Finding the Fourth Proportional to 1,123.12, 1,682.36 and 659.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,123.12 : 1,682.36 = 659.50 : x
2. Step 2: Convert to fraction form
   1,123.12/1,682.36 = 659.50/x
3. Step 3: Cross multiply
   1,123.12x = 1,682.36 × 659.50
4. Step 4: Simplify right side
   1,123.12x = 1,109,504.71
5. Step 5: Solve for x
   x = 1,109,504.71/1,123.12
6. Step 6: Final answer
   x = 987.88