Finding the Third Proportional to 316,980 and 648,533.25

Step by Step Solution

1. Step 1: Write the proportion equation
   316,980 : 648,533.25 = 648,533.25 : x
2. Step 2: Convert to fraction form
   316,980/648,533.25 = 648,533.25/x
3. Step 3: Cross multiply
   316,980x = 648,533.25 × 648,533.25
4. Step 4: Simplify right side
   316,980x = 420,595,376,355.56
5. Step 5: Solve for x
   x = 420,595,376,355.56/316,980
6. Step 6: Final answer
   x = 1,326,883.01