Finding the Third Proportional to 12,802.50 and 21,215.25

Step by Step Solution

1. Step 1: Write the proportion equation
   12,802.50 : 21,215.25 = 21,215.25 : x
2. Step 2: Convert to fraction form
   12,802.50/21,215.25 = 21,215.25/x
3. Step 3: Cross multiply
   12,802.50x = 21,215.25 × 21,215.25
4. Step 4: Simplify right side
   12,802.50x = 450,086,832.56
5. Step 5: Solve for x
   x = 450,086,832.56/12,802.50
6. Step 6: Final answer
   x = 35,156.17