Finding the Third Proportional to 9,911.63 and 21,456.38

Step by Step Solution

1. Step 1: Write the proportion equation
   9,911.63 : 21,456.38 = 21,456.38 : x
2. Step 2: Convert to fraction form
   9,911.63/21,456.38 = 21,456.38/x
3. Step 3: Cross multiply
   9,911.63x = 21,456.38 × 21,456.38
4. Step 4: Simplify right side
   9,911.63x = 460,376,028.14
5. Step 5: Solve for x
   x = 460,376,028.14/9,911.63
6. Step 6: Final answer
   x = 46,448.09