Finding the Fourth Proportional to 1,086.75, 1,499.16 and 687.74

Step by Step Solution

1. Step 1: Write the proportion equation
   1,086.75 : 1,499.16 = 687.74 : x
2. Step 2: Convert to fraction form
   1,086.75/1,499.16 = 687.74/x
3. Step 3: Cross multiply
   1,086.75x = 1,499.16 × 687.74
4. Step 4: Simplify right side
   1,086.75x = 1,031,033.00
5. Step 5: Solve for x
   x = 1,031,033.00/1,086.75
6. Step 6: Final answer
   x = 948.73