Finding the Fourth Proportional to 1,362.91, 1,867.71 and 1,231.69

Step by Step Solution

1. Step 1: Write the proportion equation
   1,362.91 : 1,867.71 = 1,231.69 : x
2. Step 2: Convert to fraction form
   1,362.91/1,867.71 = 1,231.69/x
3. Step 3: Cross multiply
   1,362.91x = 1,867.71 × 1,231.69
4. Step 4: Simplify right side
   1,362.91x = 2,300,439.73
5. Step 5: Solve for x
   x = 2,300,439.73/1,362.91
6. Step 6: Final answer
   x = 1,687.89