Finding the Third Proportional to 296,217 and 648,688.50

Step by Step Solution

1. Step 1: Write the proportion equation
   296,217 : 648,688.50 = 648,688.50 : x
2. Step 2: Convert to fraction form
   296,217/648,688.50 = 648,688.50/x
3. Step 3: Cross multiply
   296,217x = 648,688.50 × 648,688.50
4. Step 4: Simplify right side
   296,217x = 420,796,770,032.25
5. Step 5: Solve for x
   x = 420,796,770,032.25/296,217
6. Step 6: Final answer
   x = 1,420,569.28