Finding the Fourth Proportional to 577,116.42, 796,007.61 and 405,072.78

Step by Step Solution

1. Step 1: Write the proportion equation
   577,116.42 : 796,007.61 = 405,072.78 : x
2. Step 2: Convert to fraction form
   577,116.42/796,007.61 = 405,072.78/x
3. Step 3: Cross multiply
   577,116.42x = 796,007.61 × 405,072.78
4. Step 4: Simplify right side
   577,116.42x = 322,441,015,483.86
5. Step 5: Solve for x
   x = 322,441,015,483.86/577,116.42
6. Step 6: Final answer
   x = 558,710.52