Finding the Third Proportional to 12,321 and 18,616.50

Step by Step Solution

1. Step 1: Write the proportion equation
   12,321 : 18,616.50 = 18,616.50 : x
2. Step 2: Convert to fraction form
   12,321/18,616.50 = 18,616.50/x
3. Step 3: Cross multiply
   12,321x = 18,616.50 × 18,616.50
4. Step 4: Simplify right side
   12,321x = 346,574,072.25
5. Step 5: Solve for x
   x = 346,574,072.25/12,321
6. Step 6: Final answer
   x = 28,128.73