Finding the Third Proportional to 9,942 and 21,276

Step by Step Solution

1. Step 1: Write the proportion equation
   9,942 : 21,276 = 21,276 : x
2. Step 2: Convert to fraction form
   9,942/21,276 = 21,276/x
3. Step 3: Cross multiply
   9,942x = 21,276 × 21,276
4. Step 4: Simplify right side
   9,942x = 452,668,176
5. Step 5: Solve for x
   x = 452,668,176/9,942
6. Step 6: Final answer
   x = 45,530.90