Finding the Third Proportional to 12,891 and 20,425.50

Step by Step Solution

1. Step 1: Write the proportion equation
   12,891 : 20,425.50 = 20,425.50 : x
2. Step 2: Convert to fraction form
   12,891/20,425.50 = 20,425.50/x
3. Step 3: Cross multiply
   12,891x = 20,425.50 × 20,425.50
4. Step 4: Simplify right side
   12,891x = 417,201,050.25
5. Step 5: Solve for x
   x = 417,201,050.25/12,891
6. Step 6: Final answer
   x = 32,363.75