Finding the Third Proportional to 9,980 and 21,295

Step by Step Solution

1. Step 1: Write the proportion equation
   9,980 : 21,295 = 21,295 : x
2. Step 2: Convert to fraction form
   9,980/21,295 = 21,295/x
3. Step 3: Cross multiply
   9,980x = 21,295 × 21,295
4. Step 4: Simplify right side
   9,980x = 453,477,025
5. Step 5: Solve for x
   x = 453,477,025/9,980
6. Step 6: Final answer
   x = 45,438.58