Finding the Third Proportional to 11,199 and 13,251

Step by Step Solution

1. Step 1: Write the proportion equation
   11,199 : 13,251 = 13,251 : x
2. Step 2: Convert to fraction form
   11,199/13,251 = 13,251/x
3. Step 3: Cross multiply
   11,199x = 13,251 × 13,251
4. Step 4: Simplify right side
   11,199x = 175,589,001
5. Step 5: Solve for x
   x = 175,589,001/11,199
6. Step 6: Final answer
   x = 15,678.99