Finding the Third Proportional to 20,430 and 42,732

Step by Step Solution

1. Step 1: Write the proportion equation
   20,430 : 42,732 = 42,732 : x
2. Step 2: Convert to fraction form
   20,430/42,732 = 42,732/x
3. Step 3: Cross multiply
   20,430x = 42,732 × 42,732
4. Step 4: Simplify right side
   20,430x = 1,826,023,824
5. Step 5: Solve for x
   x = 1,826,023,824/20,430
6. Step 6: Final answer
   x = 89,379.53