Finding the Fourth Proportional to 356,357.78, 533,968.04 and 261,146.72

Step by Step Solution

1. Step 1: Write the proportion equation
   356,357.78 : 533,968.04 = 261,146.72 : x
2. Step 2: Convert to fraction form
   356,357.78/533,968.04 = 261,146.72/x
3. Step 3: Cross multiply
   356,357.78x = 533,968.04 × 261,146.72
4. Step 4: Simplify right side
   356,357.78x = 139,444,002,230.83
5. Step 5: Solve for x
   x = 139,444,002,230.83/356,357.78
6. Step 6: Final answer
   x = 391,303.38