Finding the Third Proportional to 420,261 and 628,906.50

Step by Step Solution

1. Step 1: Write the proportion equation
   420,261 : 628,906.50 = 628,906.50 : x
2. Step 2: Convert to fraction form
   420,261/628,906.50 = 628,906.50/x
3. Step 3: Cross multiply
   420,261x = 628,906.50 × 628,906.50
4. Step 4: Simplify right side
   420,261x = 395,523,385,742.25
5. Step 5: Solve for x
   x = 395,523,385,742.25/420,261
6. Step 6: Final answer
   x = 941,137.50