Finding the Third Proportional to 11,117 and 21,208

Step by Step Solution

1. Step 1: Write the proportion equation
   11,117 : 21,208 = 21,208 : x
2. Step 2: Convert to fraction form
   11,117/21,208 = 21,208/x
3. Step 3: Cross multiply
   11,117x = 21,208 × 21,208
4. Step 4: Simplify right side
   11,117x = 449,779,264
5. Step 5: Solve for x
   x = 449,779,264/11,117
6. Step 6: Final answer
   x = 40,458.69