Finding the Third Proportional to 12,578 and 18,870

Step by Step Solution

1. Step 1: Write the proportion equation
   12,578 : 18,870 = 18,870 : x
2. Step 2: Convert to fraction form
   12,578/18,870 = 18,870/x
3. Step 3: Cross multiply
   12,578x = 18,870 × 18,870
4. Step 4: Simplify right side
   12,578x = 356,076,900
5. Step 5: Solve for x
   x = 356,076,900/12,578
6. Step 6: Final answer
   x = 28,309.50