Finding the Third Proportional to 20,658 and 42,539.25

Step by Step Solution

1. Step 1: Write the proportion equation
   20,658 : 42,539.25 = 42,539.25 : x
2. Step 2: Convert to fraction form
   20,658/42,539.25 = 42,539.25/x
3. Step 3: Cross multiply
   20,658x = 42,539.25 × 42,539.25
4. Step 4: Simplify right side
   20,658x = 1,809,587,790.56
5. Step 5: Solve for x
   x = 1,809,587,790.56/20,658
6. Step 6: Final answer
   x = 87,597.43