Finding the Fourth Proportional to 505,581.86, 697,698.69 and 279,222.50

Step by Step Solution

1. Step 1: Write the proportion equation
   505,581.86 : 697,698.69 = 279,222.50 : x
2. Step 2: Convert to fraction form
   505,581.86/697,698.69 = 279,222.50/x
3. Step 3: Cross multiply
   505,581.86x = 697,698.69 × 279,222.50
4. Step 4: Simplify right side
   505,581.86x = 194,813,172,468.53
5. Step 5: Solve for x
   x = 194,813,172,468.53/505,581.86
6. Step 6: Final answer
   x = 385,324.69