Finding the Fourth Proportional to 410,589.78, 615,901.95 and 200,404.50

Step by Step Solution

1. Step 1: Write the proportion equation
   410,589.78 : 615,901.95 = 200,404.50 : x
2. Step 2: Convert to fraction form
   410,589.78/615,901.95 = 200,404.50/x
3. Step 3: Cross multiply
   410,589.78x = 615,901.95 × 200,404.50
4. Step 4: Simplify right side
   410,589.78x = 123,429,522,338.78
5. Step 5: Solve for x
   x = 123,429,522,338.78/410,589.78
6. Step 6: Final answer
   x = 300,615.18