Finding the Fourth Proportional to 581,078.72, 869,743.20 and 300,209.60

Step by Step Solution

1. Step 1: Write the proportion equation
   581,078.72 : 869,743.20 = 300,209.60 : x
2. Step 2: Convert to fraction form
   581,078.72/869,743.20 = 300,209.60/x
3. Step 3: Cross multiply
   581,078.72x = 869,743.20 × 300,209.60
4. Step 4: Simplify right side
   581,078.72x = 261,105,258,174.72
5. Step 5: Solve for x
   x = 261,105,258,174.72/581,078.72
6. Step 6: Final answer
   x = 449,345.76