Finding the Third Proportional to 393,978 and 573,742.50

Step by Step Solution

1. Step 1: Write the proportion equation
   393,978 : 573,742.50 = 573,742.50 : x
2. Step 2: Convert to fraction form
   393,978/573,742.50 = 573,742.50/x
3. Step 3: Cross multiply
   393,978x = 573,742.50 × 573,742.50
4. Step 4: Simplify right side
   393,978x = 329,180,456,306.25
5. Step 5: Solve for x
   x = 329,180,456,306.25/393,978
6. Step 6: Final answer
   x = 835,530.05