Finding the Third Proportional to 12,996 and 20,931

Step by Step Solution

1. Step 1: Write the proportion equation
   12,996 : 20,931 = 20,931 : x
2. Step 2: Convert to fraction form
   12,996/20,931 = 20,931/x
3. Step 3: Cross multiply
   12,996x = 20,931 × 20,931
4. Step 4: Simplify right side
   12,996x = 438,106,761
5. Step 5: Solve for x
   x = 438,106,761/12,996
6. Step 6: Final answer
   x = 33,710.89