Finding the Fourth Proportional to 505,499.92, 697,585.52 and 279,140.56

Step by Step Solution

1. Step 1: Write the proportion equation
   505,499.92 : 697,585.52 = 279,140.56 : x
2. Step 2: Convert to fraction form
   505,499.92/697,585.52 = 279,140.56/x
3. Step 3: Cross multiply
   505,499.92x = 697,585.52 × 279,140.56
4. Step 4: Simplify right side
   505,499.92x = 194,724,412,700.69
5. Step 5: Solve for x
   x = 194,724,412,700.69/505,499.92
6. Step 6: Final answer
   x = 385,211.56