Finding the Third Proportional to 9,890 and 21,340

Step by Step Solution

1. Step 1: Write the proportion equation
   9,890 : 21,340 = 21,340 : x
2. Step 2: Convert to fraction form
   9,890/21,340 = 21,340/x
3. Step 3: Cross multiply
   9,890x = 21,340 × 21,340
4. Step 4: Simplify right side
   9,890x = 455,395,600
5. Step 5: Solve for x
   x = 455,395,600/9,890
6. Step 6: Final answer
   x = 46,046.07