Finding the Third Proportional to 420,201 and 628,816.50

Step by Step Solution

1. Step 1: Write the proportion equation
   420,201 : 628,816.50 = 628,816.50 : x
2. Step 2: Convert to fraction form
   420,201/628,816.50 = 628,816.50/x
3. Step 3: Cross multiply
   420,201x = 628,816.50 × 628,816.50
4. Step 4: Simplify right side
   420,201x = 395,410,190,672.25
5. Step 5: Solve for x
   x = 395,410,190,672.25/420,201
6. Step 6: Final answer
   x = 941,002.50