Finding the Fourth Proportional to 615,978.89, 850,067.99 and 340,354.50

Step by Step Solution

1. Step 1: Write the proportion equation
   615,978.89 : 850,067.99 = 340,354.50 : x
2. Step 2: Convert to fraction form
   615,978.89/850,067.99 = 340,354.50/x
3. Step 3: Cross multiply
   615,978.89x = 850,067.99 × 340,354.50
4. Step 4: Simplify right side
   615,978.89x = 289,324,465,702.46
5. Step 5: Solve for x
   x = 289,324,465,702.46/615,978.89
6. Step 6: Final answer
   x = 469,698.67