Finding the Third Proportional to 9,992 and 21,200

Step by Step Solution

1. Step 1: Write the proportion equation
   9,992 : 21,200 = 21,200 : x
2. Step 2: Convert to fraction form
   9,992/21,200 = 21,200/x
3. Step 3: Cross multiply
   9,992x = 21,200 × 21,200
4. Step 4: Simplify right side
   9,992x = 449,440,000
5. Step 5: Solve for x
   x = 449,440,000/9,992
6. Step 6: Final answer
   x = 44,979.98