Finding the Third Proportional to 1,271 and 1,388

Step by Step Solution

1. Step 1: Write the proportion equation
   1,271 : 1,388 = 1,388 : x
2. Step 2: Convert to fraction form
   1,271/1,388 = 1,388/x
3. Step 3: Cross multiply
   1,271x = 1,388 × 1,388
4. Step 4: Simplify right side
   1,271x = 1,926,544
5. Step 5: Solve for x
   x = 1,926,544/1,271
6. Step 6: Final answer
   x = 1,515.77