Finding the Fourth Proportional to 368,086.86, 507,931.20 and 206,910.72

Step by Step Solution

1. Step 1: Write the proportion equation
   368,086.86 : 507,931.20 = 206,910.72 : x
2. Step 2: Convert to fraction form
   368,086.86/507,931.20 = 206,910.72/x
3. Step 3: Cross multiply
   368,086.86x = 507,931.20 × 206,910.72
4. Step 4: Simplify right side
   368,086.86x = 105,096,410,302.46
5. Step 5: Solve for x
   x = 105,096,410,302.46/368,086.86
6. Step 6: Final answer
   x = 285,520.68