Finding the Third Proportional to 9,938 and 21,820

Step by Step Solution

1. Step 1: Write the proportion equation
   9,938 : 21,820 = 21,820 : x
2. Step 2: Convert to fraction form
   9,938/21,820 = 21,820/x
3. Step 3: Cross multiply
   9,938x = 21,820 × 21,820
4. Step 4: Simplify right side
   9,938x = 476,112,400
5. Step 5: Solve for x
   x = 476,112,400/9,938
6. Step 6: Final answer
   x = 47,908.27