Finding the Third Proportional to 20,661.50 and 42,412

Step by Step Solution

1. Step 1: Write the proportion equation
   20,661.50 : 42,412 = 42,412 : x
2. Step 2: Convert to fraction form
   20,661.50/42,412 = 42,412/x
3. Step 3: Cross multiply
   20,661.50x = 42,412 × 42,412
4. Step 4: Simplify right side
   20,661.50x = 1,798,777,744
5. Step 5: Solve for x
   x = 1,798,777,744/20,661.50
6. Step 6: Final answer
   x = 87,059.40