Finding the Third Proportional to 298,732.50 and 645,005

Step by Step Solution

1. Step 1: Write the proportion equation
   298,732.50 : 645,005 = 645,005 : x
2. Step 2: Convert to fraction form
   298,732.50/645,005 = 645,005/x
3. Step 3: Cross multiply
   298,732.50x = 645,005 × 645,005
4. Step 4: Simplify right side
   298,732.50x = 416,031,450,025
5. Step 5: Solve for x
   x = 416,031,450,025/298,732.50
6. Step 6: Final answer
   x = 1,392,655.47