Finding the Third Proportional to 9,940 and 21,840

Step by Step Solution

1. Step 1: Write the proportion equation
   9,940 : 21,840 = 21,840 : x
2. Step 2: Convert to fraction form
   9,940/21,840 = 21,840/x
3. Step 3: Cross multiply
   9,940x = 21,840 × 21,840
4. Step 4: Simplify right side
   9,940x = 476,985,600
5. Step 5: Solve for x
   x = 476,985,600/9,940
6. Step 6: Final answer
   x = 47,986.48