Finding the Third Proportional to 20,455.50 and 42,729

Step by Step Solution

1. Step 1: Write the proportion equation
   20,455.50 : 42,729 = 42,729 : x
2. Step 2: Convert to fraction form
   20,455.50/42,729 = 42,729/x
3. Step 3: Cross multiply
   20,455.50x = 42,729 × 42,729
4. Step 4: Simplify right side
   20,455.50x = 1,825,767,441
5. Step 5: Solve for x
   x = 1,825,767,441/20,455.50
6. Step 6: Final answer
   x = 89,255.58