Finding the Third Proportional to 388,185 and 617,269.50

Step by Step Solution

1. Step 1: Write the proportion equation
   388,185 : 617,269.50 = 617,269.50 : x
2. Step 2: Convert to fraction form
   388,185/617,269.50 = 617,269.50/x
3. Step 3: Cross multiply
   388,185x = 617,269.50 × 617,269.50
4. Step 4: Simplify right side
   388,185x = 381,021,635,630.25
5. Step 5: Solve for x
   x = 381,021,635,630.25/388,185
6. Step 6: Final answer
   x = 981,546.52