Finding the Third Proportional to 288,003 and 395,509.50

Step by Step Solution

1. Step 1: Write the proportion equation
   288,003 : 395,509.50 = 395,509.50 : x
2. Step 2: Convert to fraction form
   288,003/395,509.50 = 395,509.50/x
3. Step 3: Cross multiply
   288,003x = 395,509.50 × 395,509.50
4. Step 4: Simplify right side
   288,003x = 156,427,764,590.25
5. Step 5: Solve for x
   x = 156,427,764,590.25/288,003
6. Step 6: Final answer
   x = 543,146.30