Finding the Third Proportional to 393,911 and 573,642.50

Step by Step Solution

1. Step 1: Write the proportion equation
   393,911 : 573,642.50 = 573,642.50 : x
2. Step 2: Convert to fraction form
   393,911/573,642.50 = 573,642.50/x
3. Step 3: Cross multiply
   393,911x = 573,642.50 × 573,642.50
4. Step 4: Simplify right side
   393,911x = 329,065,717,806.25
5. Step 5: Solve for x
   x = 329,065,717,806.25/393,911
6. Step 6: Final answer
   x = 835,380.88