Finding the Third Proportional to 20,121.75 and 42,842.25

Step by Step Solution

1. Step 1: Write the proportion equation
   20,121.75 : 42,842.25 = 42,842.25 : x
2. Step 2: Convert to fraction form
   20,121.75/42,842.25 = 42,842.25/x
3. Step 3: Cross multiply
   20,121.75x = 42,842.25 × 42,842.25
4. Step 4: Simplify right side
   20,121.75x = 1,835,458,385.06
5. Step 5: Solve for x
   x = 1,835,458,385.06/20,121.75
6. Step 6: Final answer
   x = 91,217.63