Finding the Third Proportional to 394,535 and 558,259.50

Step by Step Solution

1. Step 1: Write the proportion equation
   394,535 : 558,259.50 = 558,259.50 : x
2. Step 2: Convert to fraction form
   394,535/558,259.50 = 558,259.50/x
3. Step 3: Cross multiply
   394,535x = 558,259.50 × 558,259.50
4. Step 4: Simplify right side
   394,535x = 311,653,669,340.25
5. Step 5: Solve for x
   x = 311,653,669,340.25/394,535
6. Step 6: Final answer
   x = 789,926.54