Finding the Third Proportional to 396,468 and 638,374.50

Step by Step Solution

1. Step 1: Write the proportion equation
   396,468 : 638,374.50 = 638,374.50 : x
2. Step 2: Convert to fraction form
   396,468/638,374.50 = 638,374.50/x
3. Step 3: Cross multiply
   396,468x = 638,374.50 × 638,374.50
4. Step 4: Simplify right side
   396,468x = 407,522,002,250.25
5. Step 5: Solve for x
   x = 407,522,002,250.25/396,468
6. Step 6: Final answer
   x = 1,027,881.20