Finding the Third Proportional to 20,078.25 and 42,417

Step by Step Solution

1. Step 1: Write the proportion equation
   20,078.25 : 42,417 = 42,417 : x
2. Step 2: Convert to fraction form
   20,078.25/42,417 = 42,417/x
3. Step 3: Cross multiply
   20,078.25x = 42,417 × 42,417
4. Step 4: Simplify right side
   20,078.25x = 1,799,201,889
5. Step 5: Solve for x
   x = 1,799,201,889/20,078.25
6. Step 6: Final answer
   x = 89,609.50