Finding the Third Proportional to 9,999.25 and 21,231.50

Step by Step Solution

1. Step 1: Write the proportion equation
   9,999.25 : 21,231.50 = 21,231.50 : x
2. Step 2: Convert to fraction form
   9,999.25/21,231.50 = 21,231.50/x
3. Step 3: Cross multiply
   9,999.25x = 21,231.50 × 21,231.50
4. Step 4: Simplify right side
   9,999.25x = 450,776,592.25
5. Step 5: Solve for x
   x = 450,776,592.25/9,999.25
6. Step 6: Final answer
   x = 45,081.04