Finding the Third Proportional to 394,647 and 558,436.50

Step by Step Solution

1. Step 1: Write the proportion equation
   394,647 : 558,436.50 = 558,436.50 : x
2. Step 2: Convert to fraction form
   394,647/558,436.50 = 558,436.50/x
3. Step 3: Cross multiply
   394,647x = 558,436.50 × 558,436.50
4. Step 4: Simplify right side
   394,647x = 311,851,324,532.25
5. Step 5: Solve for x
   x = 311,851,324,532.25/394,647
6. Step 6: Final answer
   x = 790,203.21