Finding the Third Proportional to 39,420 and 59,540

Step by Step Solution

1. Step 1: Write the proportion equation
   39,420 : 59,540 = 59,540 : x
2. Step 2: Convert to fraction form
   39,420/59,540 = 59,540/x
3. Step 3: Cross multiply
   39,420x = 59,540 × 59,540
4. Step 4: Simplify right side
   39,420x = 3,545,011,600
5. Step 5: Solve for x
   x = 3,545,011,600/39,420
6. Step 6: Final answer
   x = 89,929.26