Finding the Third Proportional to 9,786 and 21,156

Step by Step Solution

1. Step 1: Write the proportion equation
   9,786 : 21,156 = 21,156 : x
2. Step 2: Convert to fraction form
   9,786/21,156 = 21,156/x
3. Step 3: Cross multiply
   9,786x = 21,156 × 21,156
4. Step 4: Simplify right side
   9,786x = 447,576,336
5. Step 5: Solve for x
   x = 447,576,336/9,786
6. Step 6: Final answer
   x = 45,736.39