Finding the Third Proportional to 388,915 and 583,738.50

Step by Step Solution

1. Step 1: Write the proportion equation
   388,915 : 583,738.50 = 583,738.50 : x
2. Step 2: Convert to fraction form
   388,915/583,738.50 = 583,738.50/x
3. Step 3: Cross multiply
   388,915x = 583,738.50 × 583,738.50
4. Step 4: Simplify right side
   388,915x = 340,750,636,382.25
5. Step 5: Solve for x
   x = 340,750,636,382.25/388,915
6. Step 6: Final answer
   x = 876,157.09