Finding the Third Proportional to 21,012 and 42,984

Step by Step Solution

1. Step 1: Write the proportion equation
   21,012 : 42,984 = 42,984 : x
2. Step 2: Convert to fraction form
   21,012/42,984 = 42,984/x
3. Step 3: Cross multiply
   21,012x = 42,984 × 42,984
4. Step 4: Simplify right side
   21,012x = 1,847,624,256
5. Step 5: Solve for x
   x = 1,847,624,256/21,012
6. Step 6: Final answer
   x = 87,931.86