Finding the Fourth Proportional to 1,123.22, 1,682.22 and 660.08

Step by Step Solution

1. Step 1: Write the proportion equation
   1,123.22 : 1,682.22 = 660.08 : x
2. Step 2: Convert to fraction form
   1,123.22/1,682.22 = 660.08/x
3. Step 3: Cross multiply
   1,123.22x = 1,682.22 × 660.08
4. Step 4: Simplify right side
   1,123.22x = 1,110,399.78
5. Step 5: Solve for x
   x = 1,110,399.78/1,123.22
6. Step 6: Final answer
   x = 988.59