Finding the Third Proportional to 9,816.50 and 21,212.50

Step by Step Solution

1. Step 1: Write the proportion equation
   9,816.50 : 21,212.50 = 21,212.50 : x
2. Step 2: Convert to fraction form
   9,816.50/21,212.50 = 21,212.50/x
3. Step 3: Cross multiply
   9,816.50x = 21,212.50 × 21,212.50
4. Step 4: Simplify right side
   9,816.50x = 449,970,156.25
5. Step 5: Solve for x
   x = 449,970,156.25/9,816.50
6. Step 6: Final answer
   x = 45,838.15