Finding the Third Proportional to 64,380 and 139,480

Step by Step Solution

1. Step 1: Write the proportion equation
   64,380 : 139,480 = 139,480 : x
2. Step 2: Convert to fraction form
   64,380/139,480 = 139,480/x
3. Step 3: Cross multiply
   64,380x = 139,480 × 139,480
4. Step 4: Simplify right side
   64,380x = 19,454,670,400
5. Step 5: Solve for x
   x = 19,454,670,400/64,380
6. Step 6: Final answer
   x = 302,185.00