Finding the Third Proportional to 12,658 and 19,643

Step by Step Solution

1. Step 1: Write the proportion equation
   12,658 : 19,643 = 19,643 : x
2. Step 2: Convert to fraction form
   12,658/19,643 = 19,643/x
3. Step 3: Cross multiply
   12,658x = 19,643 × 19,643
4. Step 4: Simplify right side
   12,658x = 385,847,449
5. Step 5: Solve for x
   x = 385,847,449/12,658
6. Step 6: Final answer
   x = 30,482.50