Finding the Fourth Proportional to 262,586.52, 393,624.72 and 209,148.12

Step by Step Solution

1. Step 1: Write the proportion equation
   262,586.52 : 393,624.72 = 209,148.12 : x
2. Step 2: Convert to fraction form
   262,586.52/393,624.72 = 209,148.12/x
3. Step 3: Cross multiply
   262,586.52x = 393,624.72 × 209,148.12
4. Step 4: Simplify right side
   262,586.52x = 82,325,870,173.53
5. Step 5: Solve for x
   x = 82,325,870,173.53/262,586.52
6. Step 6: Final answer
   x = 313,519.03