Finding the Fourth Proportional to 1,086.27, 1,627.76 and 719.75

Step by Step Solution

1. Step 1: Write the proportion equation
   1,086.27 : 1,627.76 = 719.75 : x
2. Step 2: Convert to fraction form
   1,086.27/1,627.76 = 719.75/x
3. Step 3: Cross multiply
   1,086.27x = 1,627.76 × 719.75
4. Step 4: Simplify right side
   1,086.27x = 1,171,573.92
5. Step 5: Solve for x
   x = 1,171,573.92/1,086.27
6. Step 6: Final answer
   x = 1,078.53