Finding the Third Proportional to 20,040 and 42,240

Step by Step Solution

1. Step 1: Write the proportion equation
   20,040 : 42,240 = 42,240 : x
2. Step 2: Convert to fraction form
   20,040/42,240 = 42,240/x
3. Step 3: Cross multiply
   20,040x = 42,240 × 42,240
4. Step 4: Simplify right side
   20,040x = 1,784,217,600
5. Step 5: Solve for x
   x = 1,784,217,600/20,040
6. Step 6: Final answer
   x = 89,032.81