Finding the Third Proportional to 20,427 and 42,915

Step by Step Solution

1. Step 1: Write the proportion equation
   20,427 : 42,915 = 42,915 : x
2. Step 2: Convert to fraction form
   20,427/42,915 = 42,915/x
3. Step 3: Cross multiply
   20,427x = 42,915 × 42,915
4. Step 4: Simplify right side
   20,427x = 1,841,697,225
5. Step 5: Solve for x
   x = 1,841,697,225/20,427
6. Step 6: Final answer
   x = 90,159.95