Finding the Fourth Proportional to 1,643.27, 2,267.76 and 935.21

Step by Step Solution

1. Step 1: Write the proportion equation
   1,643.27 : 2,267.76 = 935.21 : x
2. Step 2: Convert to fraction form
   1,643.27/2,267.76 = 935.21/x
3. Step 3: Cross multiply
   1,643.27x = 2,267.76 × 935.21
4. Step 4: Simplify right side
   1,643.27x = 2,120,831.83
5. Step 5: Solve for x
   x = 2,120,831.83/1,643.27
6. Step 6: Final answer
   x = 1,290.62