Finding the Third Proportional to 63,209 and 139,540

Step by Step Solution

1. Step 1: Write the proportion equation
   63,209 : 139,540 = 139,540 : x
2. Step 2: Convert to fraction form
   63,209/139,540 = 139,540/x
3. Step 3: Cross multiply
   63,209x = 139,540 × 139,540
4. Step 4: Simplify right side
   63,209x = 19,471,411,600
5. Step 5: Solve for x
   x = 19,471,411,600/63,209
6. Step 6: Final answer
   x = 308,048.09