Finding the Third Proportional to 299,485.50 and 648,765

Step by Step Solution

1. Step 1: Write the proportion equation
   299,485.50 : 648,765 = 648,765 : x
2. Step 2: Convert to fraction form
   299,485.50/648,765 = 648,765/x
3. Step 3: Cross multiply
   299,485.50x = 648,765 × 648,765
4. Step 4: Simplify right side
   299,485.50x = 420,896,025,225
5. Step 5: Solve for x
   x = 420,896,025,225/299,485.50
6. Step 6: Final answer
   x = 1,405,397.01