Finding the Third Proportional to 19,721.50 and 42,450

Step by Step Solution

1. Step 1: Write the proportion equation
   19,721.50 : 42,450 = 42,450 : x
2. Step 2: Convert to fraction form
   19,721.50/42,450 = 42,450/x
3. Step 3: Cross multiply
   19,721.50x = 42,450 × 42,450
4. Step 4: Simplify right side
   19,721.50x = 1,802,002,500
5. Step 5: Solve for x
   x = 1,802,002,500/19,721.50
6. Step 6: Final answer
   x = 91,372.49