Finding the Third Proportional to 9,158 and 12,321

Step by Step Solution

1. Step 1: Write the proportion equation
   9,158 : 12,321 = 12,321 : x
2. Step 2: Convert to fraction form
   9,158/12,321 = 12,321/x
3. Step 3: Cross multiply
   9,158x = 12,321 × 12,321
4. Step 4: Simplify right side
   9,158x = 151,807,041
5. Step 5: Solve for x
   x = 151,807,041/9,158
6. Step 6: Final answer
   x = 16,576.44