Finding the Third Proportional to 9,900.25 and 20,619.25

Step by Step Solution

1. Step 1: Write the proportion equation
   9,900.25 : 20,619.25 = 20,619.25 : x
2. Step 2: Convert to fraction form
   9,900.25/20,619.25 = 20,619.25/x
3. Step 3: Cross multiply
   9,900.25x = 20,619.25 × 20,619.25
4. Step 4: Simplify right side
   9,900.25x = 425,153,470.56
5. Step 5: Solve for x
   x = 425,153,470.56/9,900.25
6. Step 6: Final answer
   x = 42,943.71