Finding the Third Proportional to 298,623 and 624,907.50

Step by Step Solution

1. Step 1: Write the proportion equation
   298,623 : 624,907.50 = 624,907.50 : x
2. Step 2: Convert to fraction form
   298,623/624,907.50 = 624,907.50/x
3. Step 3: Cross multiply
   298,623x = 624,907.50 × 624,907.50
4. Step 4: Simplify right side
   298,623x = 390,509,383,556.25
5. Step 5: Solve for x
   x = 390,509,383,556.25/298,623
6. Step 6: Final answer
   x = 1,307,700.29