Finding the Third Proportional to 9,858 and 21,279

Step by Step Solution

1. Step 1: Write the proportion equation
   9,858 : 21,279 = 21,279 : x
2. Step 2: Convert to fraction form
   9,858/21,279 = 21,279/x
3. Step 3: Cross multiply
   9,858x = 21,279 × 21,279
4. Step 4: Simplify right side
   9,858x = 452,795,841
5. Step 5: Solve for x
   x = 452,795,841/9,858
6. Step 6: Final answer
   x = 45,931.82