Finding the Fourth Proportional to 1,105.23, 1,657.79 and 671.47

Step by Step Solution

1. Step 1: Write the proportion equation
   1,105.23 : 1,657.79 = 671.47 : x
2. Step 2: Convert to fraction form
   1,105.23/1,657.79 = 671.47/x
3. Step 3: Cross multiply
   1,105.23x = 1,657.79 × 671.47
4. Step 4: Simplify right side
   1,105.23x = 1,113,156.25
5. Step 5: Solve for x
   x = 1,113,156.25/1,105.23
6. Step 6: Final answer
   x = 1,007.17