Finding the Third Proportional to 12,261 and 18,429

Step by Step Solution

1. Step 1: Write the proportion equation
   12,261 : 18,429 = 18,429 : x
2. Step 2: Convert to fraction form
   12,261/18,429 = 18,429/x
3. Step 3: Cross multiply
   12,261x = 18,429 × 18,429
4. Step 4: Simplify right side
   12,261x = 339,628,041
5. Step 5: Solve for x
   x = 339,628,041/12,261
6. Step 6: Final answer
   x = 27,699.86