Finding the Third Proportional to 814 and 1,290.50

Step by Step Solution

1. Step 1: Write the proportion equation
   814 : 1,290.50 = 1,290.50 : x
2. Step 2: Convert to fraction form
   814/1,290.50 = 1,290.50/x
3. Step 3: Cross multiply
   814x = 1,290.50 × 1,290.50
4. Step 4: Simplify right side
   814x = 1,665,390.25
5. Step 5: Solve for x
   x = 1,665,390.25/814
6. Step 6: Final answer
   x = 2,045.93