Finding the Fourth Proportional to 499,612, 689,464.56 and 273,257.50

Step by Step Solution

1. Step 1: Write the proportion equation
   499,612 : 689,464.56 = 273,257.50 : x
2. Step 2: Convert to fraction form
   499,612/689,464.56 = 273,257.50/x
3. Step 3: Cross multiply
   499,612x = 689,464.56 × 273,257.50
4. Step 4: Simplify right side
   499,612x = 188,401,362,004.20
5. Step 5: Solve for x
   x = 188,401,362,004.20/499,612
6. Step 6: Final answer
   x = 377,095.35