Finding the Third Proportional to 139,007.25 and 305,078.63

Step by Step Solution

1. Step 1: Write the proportion equation
   139,007.25 : 305,078.63 = 305,078.63 : x
2. Step 2: Convert to fraction form
   139,007.25/305,078.63 = 305,078.63/x
3. Step 3: Cross multiply
   139,007.25x = 305,078.63 × 305,078.63
4. Step 4: Simplify right side
   139,007.25x = 93,072,967,431.89
5. Step 5: Solve for x
   x = 93,072,967,431.89/139,007.25
6. Step 6: Final answer
   x = 669,554.77