Finding the Third Proportional to 139,008 and 288,336

Step by Step Solution

1. Step 1: Write the proportion equation
   139,008 : 288,336 = 288,336 : x
2. Step 2: Convert to fraction form
   139,008/288,336 = 288,336/x
3. Step 3: Cross multiply
   139,008x = 288,336 × 288,336
4. Step 4: Simplify right side
   139,008x = 83,137,648,896
5. Step 5: Solve for x
   x = 83,137,648,896/139,008
6. Step 6: Final answer
   x = 598,078.16