Finding the Fourth Proportional to 647,981.37, 972,405.90 and 268,902.50

Step by Step Solution

1. Step 1: Write the proportion equation
   647,981.37 : 972,405.90 = 268,902.50 : x
2. Step 2: Convert to fraction form
   647,981.37/972,405.90 = 268,902.50/x
3. Step 3: Cross multiply
   647,981.37x = 972,405.90 × 268,902.50
4. Step 4: Simplify right side
   647,981.37x = 261,482,372,662.72
5. Step 5: Solve for x
   x = 261,482,372,662.72/647,981.37
6. Step 6: Final answer
   x = 403,533.78