Finding the Third Proportional to 9,999 and 21,511.50

Step by Step Solution

1. Step 1: Write the proportion equation
   9,999 : 21,511.50 = 21,511.50 : x
2. Step 2: Convert to fraction form
   9,999/21,511.50 = 21,511.50/x
3. Step 3: Cross multiply
   9,999x = 21,511.50 × 21,511.50
4. Step 4: Simplify right side
   9,999x = 462,744,632.25
5. Step 5: Solve for x
   x = 462,744,632.25/9,999
6. Step 6: Final answer
   x = 46,279.09