Finding the Third Proportional to 422,644 and 618,793.50

Step by Step Solution

1. Step 1: Write the proportion equation
   422,644 : 618,793.50 = 618,793.50 : x
2. Step 2: Convert to fraction form
   422,644/618,793.50 = 618,793.50/x
3. Step 3: Cross multiply
   422,644x = 618,793.50 × 618,793.50
4. Step 4: Simplify right side
   422,644x = 382,905,395,642.25
5. Step 5: Solve for x
   x = 382,905,395,642.25/422,644
6. Step 6: Final answer
   x = 905,976.18