Finding the Third Proportional to 9,899 and 21,782

Step by Step Solution

1. Step 1: Write the proportion equation
   9,899 : 21,782 = 21,782 : x
2. Step 2: Convert to fraction form
   9,899/21,782 = 21,782/x
3. Step 3: Cross multiply
   9,899x = 21,782 × 21,782
4. Step 4: Simplify right side
   9,899x = 474,455,524
5. Step 5: Solve for x
   x = 474,455,524/9,899
6. Step 6: Final answer
   x = 47,929.64