Finding the Fourth Proportional to 1,086.73, 1,499.69 and 638.48

Step by Step Solution

1. Step 1: Write the proportion equation
   1,086.73 : 1,499.69 = 638.48 : x
2. Step 2: Convert to fraction form
   1,086.73/1,499.69 = 638.48/x
3. Step 3: Cross multiply
   1,086.73x = 1,499.69 × 638.48
4. Step 4: Simplify right side
   1,086.73x = 957,517.48
5. Step 5: Solve for x
   x = 957,517.48/1,086.73
6. Step 6: Final answer
   x = 881.10