Finding the Third Proportional to 21,684 and 25,428

Step by Step Solution

1. Step 1: Write the proportion equation
   21,684 : 25,428 = 25,428 : x
2. Step 2: Convert to fraction form
   21,684/25,428 = 25,428/x
3. Step 3: Cross multiply
   21,684x = 25,428 × 25,428
4. Step 4: Simplify right side
   21,684x = 646,583,184
5. Step 5: Solve for x
   x = 646,583,184/21,684
6. Step 6: Final answer
   x = 29,818.45