Finding the Third Proportional to 11,115 and 12,315

Step by Step Solution

1. Step 1: Write the proportion equation
   11,115 : 12,315 = 12,315 : x
2. Step 2: Convert to fraction form
   11,115/12,315 = 12,315/x
3. Step 3: Cross multiply
   11,115x = 12,315 × 12,315
4. Step 4: Simplify right side
   11,115x = 151,659,225
5. Step 5: Solve for x
   x = 151,659,225/11,115
6. Step 6: Final answer
   x = 13,644.55