Finding the Fourth Proportional to 1,105.23, 1,658.13 and 447.15

Step by Step Solution

1. Step 1: Write the proportion equation
   1,105.23 : 1,658.13 = 447.15 : x
2. Step 2: Convert to fraction form
   1,105.23/1,658.13 = 447.15/x
3. Step 3: Cross multiply
   1,105.23x = 1,658.13 × 447.15
4. Step 4: Simplify right side
   1,105.23x = 741,432.83
5. Step 5: Solve for x
   x = 741,432.83/1,105.23
6. Step 6: Final answer
   x = 670.84