Finding the Third Proportional to 9,866.75 and 21,137.50

Step by Step Solution

1. Step 1: Write the proportion equation
   9,866.75 : 21,137.50 = 21,137.50 : x
2. Step 2: Convert to fraction form
   9,866.75/21,137.50 = 21,137.50/x
3. Step 3: Cross multiply
   9,866.75x = 21,137.50 × 21,137.50
4. Step 4: Simplify right side
   9,866.75x = 446,793,906.25
5. Step 5: Solve for x
   x = 446,793,906.25/9,866.75
6. Step 6: Final answer
   x = 45,282.78