Finding the Third Proportional to 20,777.50 and 42,780.25

Step by Step Solution

1. Step 1: Write the proportion equation
   20,777.50 : 42,780.25 = 42,780.25 : x
2. Step 2: Convert to fraction form
   20,777.50/42,780.25 = 42,780.25/x
3. Step 3: Cross multiply
   20,777.50x = 42,780.25 × 42,780.25
4. Step 4: Simplify right side
   20,777.50x = 1,830,149,790.06
5. Step 5: Solve for x
   x = 1,830,149,790.06/20,777.50
6. Step 6: Final answer
   x = 88,083.25