Finding the Third Proportional to 10,415.25 and 21,217.50

Step by Step Solution

1. Step 1: Write the proportion equation
   10,415.25 : 21,217.50 = 21,217.50 : x
2. Step 2: Convert to fraction form
   10,415.25/21,217.50 = 21,217.50/x
3. Step 3: Cross multiply
   10,415.25x = 21,217.50 × 21,217.50
4. Step 4: Simplify right side
   10,415.25x = 450,182,306.25
5. Step 5: Solve for x
   x = 450,182,306.25/10,415.25
6. Step 6: Final answer
   x = 43,223.38