Finding the Fourth Proportional to 505,435.89, 697,498.09 and 279,081.39

Step by Step Solution

1. Step 1: Write the proportion equation
   505,435.89 : 697,498.09 = 279,081.39 : x
2. Step 2: Convert to fraction form
   505,435.89/697,498.09 = 279,081.39/x
3. Step 3: Cross multiply
   505,435.89x = 697,498.09 × 279,081.39
4. Step 4: Simplify right side
   505,435.89x = 194,658,736,479.55
5. Step 5: Solve for x
   x = 194,658,736,479.55/505,435.89
6. Step 6: Final answer
   x = 385,130.42