Finding the Third Proportional to 10,212.75 and 21,458.25

Step by Step Solution

1. Step 1: Write the proportion equation
   10,212.75 : 21,458.25 = 21,458.25 : x
2. Step 2: Convert to fraction form
   10,212.75/21,458.25 = 21,458.25/x
3. Step 3: Cross multiply
   10,212.75x = 21,458.25 × 21,458.25
4. Step 4: Simplify right side
   10,212.75x = 460,456,493.06
5. Step 5: Solve for x
   x = 460,456,493.06/10,212.75
6. Step 6: Final answer
   x = 45,086.44