Finding the Third Proportional to 1,240 and 1,429

Step by Step Solution

1. Step 1: Write the proportion equation
   1,240 : 1,429 = 1,429 : x
2. Step 2: Convert to fraction form
   1,240/1,429 = 1,429/x
3. Step 3: Cross multiply
   1,240x = 1,429 × 1,429
4. Step 4: Simplify right side
   1,240x = 2,042,041
5. Step 5: Solve for x
   x = 2,042,041/1,240
6. Step 6: Final answer
   x = 1,646.81