Finding the Third Proportional to 12,996 and 20,155.50

Step by Step Solution

1. Step 1: Write the proportion equation
   12,996 : 20,155.50 = 20,155.50 : x
2. Step 2: Convert to fraction form
   12,996/20,155.50 = 20,155.50/x
3. Step 3: Cross multiply
   12,996x = 20,155.50 × 20,155.50
4. Step 4: Simplify right side
   12,996x = 406,244,180.25
5. Step 5: Solve for x
   x = 406,244,180.25/12,996
6. Step 6: Final answer
   x = 31,259.17