Finding the Third Proportional to 10,917 and 12,321

Step by Step Solution

1. Step 1: Write the proportion equation
   10,917 : 12,321 = 12,321 : x
2. Step 2: Convert to fraction form
   10,917/12,321 = 12,321/x
3. Step 3: Cross multiply
   10,917x = 12,321 × 12,321
4. Step 4: Simplify right side
   10,917x = 151,807,041
5. Step 5: Solve for x
   x = 151,807,041/10,917
6. Step 6: Final answer
   x = 13,905.56