Finding the Fourth Proportional to 1,088.73, 1,634.27 and 439.89

Step by Step Solution

1. Step 1: Write the proportion equation
   1,088.73 : 1,634.27 = 439.89 : x
2. Step 2: Convert to fraction form
   1,088.73/1,634.27 = 439.89/x
3. Step 3: Cross multiply
   1,088.73x = 1,634.27 × 439.89
4. Step 4: Simplify right side
   1,088.73x = 718,896.83
5. Step 5: Solve for x
   x = 718,896.83/1,088.73
6. Step 6: Final answer
   x = 660.31