Finding the Third Proportional to 20,643 and 42,375

Step by Step Solution

1. Step 1: Write the proportion equation
   20,643 : 42,375 = 42,375 : x
2. Step 2: Convert to fraction form
   20,643/42,375 = 42,375/x
3. Step 3: Cross multiply
   20,643x = 42,375 × 42,375
4. Step 4: Simplify right side
   20,643x = 1,795,640,625
5. Step 5: Solve for x
   x = 1,795,640,625/20,643
6. Step 6: Final answer
   x = 86,985.45