Finding the Third Proportional to 1,218 and 1,428

Step by Step Solution

1. Step 1: Write the proportion equation
   1,218 : 1,428 = 1,428 : x
2. Step 2: Convert to fraction form
   1,218/1,428 = 1,428/x
3. Step 3: Cross multiply
   1,218x = 1,428 × 1,428
4. Step 4: Simplify right side
   1,218x = 2,039,184
5. Step 5: Solve for x
   x = 2,039,184/1,218
6. Step 6: Final answer
   x = 1,674.21