Finding the Fourth Proportional to 615,311.92, 923,379.72 and 215,954.56

Step by Step Solution

1. Step 1: Write the proportion equation
   615,311.92 : 923,379.72 = 215,954.56 : x
2. Step 2: Convert to fraction form
   615,311.92/923,379.72 = 215,954.56/x
3. Step 3: Cross multiply
   615,311.92x = 923,379.72 × 215,954.56
4. Step 4: Simplify right side
   615,311.92x = 199,408,061,145.52
5. Step 5: Solve for x
   x = 199,408,061,145.52/615,311.92
6. Step 6: Final answer
   x = 324,076.38