Finding the Third Proportional to 20,509.50 and 42,336

Step by Step Solution

1. Step 1: Write the proportion equation
   20,509.50 : 42,336 = 42,336 : x
2. Step 2: Convert to fraction form
   20,509.50/42,336 = 42,336/x
3. Step 3: Cross multiply
   20,509.50x = 42,336 × 42,336
4. Step 4: Simplify right side
   20,509.50x = 1,792,336,896
5. Step 5: Solve for x
   x = 1,792,336,896/20,509.50
6. Step 6: Final answer
   x = 87,390.57