Finding the Third Proportional to 63,998 and 139,640

Step by Step Solution

1. Step 1: Write the proportion equation
   63,998 : 139,640 = 139,640 : x
2. Step 2: Convert to fraction form
   63,998/139,640 = 139,640/x
3. Step 3: Cross multiply
   63,998x = 139,640 × 139,640
4. Step 4: Simplify right side
   63,998x = 19,499,329,600
5. Step 5: Solve for x
   x = 19,499,329,600/63,998
6. Step 6: Final answer
   x = 304,686.55