Finding the Third Proportional to 10,647.56 and 21,978.56

Step by Step Solution

1. Step 1: Write the proportion equation
   10,647.56 : 21,978.56 = 21,978.56 : x
2. Step 2: Convert to fraction form
   10,647.56/21,978.56 = 21,978.56/x
3. Step 3: Cross multiply
   10,647.56x = 21,978.56 × 21,978.56
4. Step 4: Simplify right side
   10,647.56x = 483,057,209.57
5. Step 5: Solve for x
   x = 483,057,209.57/10,647.56
6. Step 6: Final answer
   x = 45,367.87