Finding the Third Proportional to 243,777 and 389,281.50

Step by Step Solution

1. Step 1: Write the proportion equation
   243,777 : 389,281.50 = 389,281.50 : x
2. Step 2: Convert to fraction form
   243,777/389,281.50 = 389,281.50/x
3. Step 3: Cross multiply
   243,777x = 389,281.50 × 389,281.50
4. Step 4: Simplify right side
   243,777x = 151,540,086,242.25
5. Step 5: Solve for x
   x = 151,540,086,242.25/243,777
6. Step 6: Final answer
   x = 621,634.06