Finding the Third Proportional to 20,490 and 42,708

Step by Step Solution

1. Step 1: Write the proportion equation
   20,490 : 42,708 = 42,708 : x
2. Step 2: Convert to fraction form
   20,490/42,708 = 42,708/x
3. Step 3: Cross multiply
   20,490x = 42,708 × 42,708
4. Step 4: Simplify right side
   20,490x = 1,823,973,264
5. Step 5: Solve for x
   x = 1,823,973,264/20,490
6. Step 6: Final answer
   x = 89,017.73