Finding the Third Proportional to 12,158 and 18,210

Step by Step Solution

1. Step 1: Write the proportion equation
   12,158 : 18,210 = 18,210 : x
2. Step 2: Convert to fraction form
   12,158/18,210 = 18,210/x
3. Step 3: Cross multiply
   12,158x = 18,210 × 18,210
4. Step 4: Simplify right side
   12,158x = 331,604,100
5. Step 5: Solve for x
   x = 331,604,100/12,158
6. Step 6: Final answer
   x = 27,274.56