Finding the Fourth Proportional to 1,086.69, 1,499.94 and 890.67

Step by Step Solution

1. Step 1: Write the proportion equation
   1,086.69 : 1,499.94 = 890.67 : x
2. Step 2: Convert to fraction form
   1,086.69/1,499.94 = 890.67/x
3. Step 3: Cross multiply
   1,086.69x = 1,499.94 × 890.67
4. Step 4: Simplify right side
   1,086.69x = 1,335,951.56
5. Step 5: Solve for x
   x = 1,335,951.56/1,086.69
6. Step 6: Final answer
   x = 1,229.38