Finding the Third Proportional to 12,490 and 18,869.50

Step by Step Solution

1. Step 1: Write the proportion equation
   12,490 : 18,869.50 = 18,869.50 : x
2. Step 2: Convert to fraction form
   12,490/18,869.50 = 18,869.50/x
3. Step 3: Cross multiply
   12,490x = 18,869.50 × 18,869.50
4. Step 4: Simplify right side
   12,490x = 356,058,030.25
5. Step 5: Solve for x
   x = 356,058,030.25/12,490
6. Step 6: Final answer
   x = 28,507.45