Finding the Fourth Proportional to 645,667.59, 967,615.42 and 408,585.86

Step by Step Solution

1. Step 1: Write the proportion equation
   645,667.59 : 967,615.42 = 408,585.86 : x
2. Step 2: Convert to fraction form
   645,667.59/967,615.42 = 408,585.86/x
3. Step 3: Cross multiply
   645,667.59x = 967,615.42 × 408,585.86
4. Step 4: Simplify right side
   645,667.59x = 395,353,978,529.96
5. Step 5: Solve for x
   x = 395,353,978,529.96/645,667.59
6. Step 6: Final answer
   x = 612,318.14