Finding the Fourth Proportional to 1,086.12, 1,629.37 and 647.73

Step by Step Solution

1. Step 1: Write the proportion equation
   1,086.12 : 1,629.37 = 647.73 : x
2. Step 2: Convert to fraction form
   1,086.12/1,629.37 = 647.73/x
3. Step 3: Cross multiply
   1,086.12x = 1,629.37 × 647.73
4. Step 4: Simplify right side
   1,086.12x = 1,055,391.83
5. Step 5: Solve for x
   x = 1,055,391.83/1,086.12
6. Step 6: Final answer
   x = 971.71