Finding the Fourth Proportional to 1,105.72, 1,654.44 and 667.15

Step by Step Solution

1. Step 1: Write the proportion equation
   1,105.72 : 1,654.44 = 667.15 : x
2. Step 2: Convert to fraction form
   1,105.72/1,654.44 = 667.15/x
3. Step 3: Cross multiply
   1,105.72x = 1,654.44 × 667.15
4. Step 4: Simplify right side
   1,105.72x = 1,103,759.65
5. Step 5: Solve for x
   x = 1,103,759.65/1,105.72
6. Step 6: Final answer
   x = 998.23