Finding the Fourth Proportional to 1,105.57, 1,657.72 and 447.42

Step by Step Solution

1. Step 1: Write the proportion equation
   1,105.57 : 1,657.72 = 447.42 : x
2. Step 2: Convert to fraction form
   1,105.57/1,657.72 = 447.42/x
3. Step 3: Cross multiply
   1,105.57x = 1,657.72 × 447.42
4. Step 4: Simplify right side
   1,105.57x = 741,701.34
5. Step 5: Solve for x
   x = 741,701.34/1,105.57
6. Step 6: Final answer
   x = 670.87