Finding the Third Proportional to 12,087 and 18,490.50

Step by Step Solution

1. Step 1: Write the proportion equation
   12,087 : 18,490.50 = 18,490.50 : x
2. Step 2: Convert to fraction form
   12,087/18,490.50 = 18,490.50/x
3. Step 3: Cross multiply
   12,087x = 18,490.50 × 18,490.50
4. Step 4: Simplify right side
   12,087x = 341,898,590.25
5. Step 5: Solve for x
   x = 341,898,590.25/12,087
6. Step 6: Final answer
   x = 28,286.47