Finding the Fourth Proportional to 388,359.94, 536,101.89 and 261,109.30

Step by Step Solution

1. Step 1: Write the proportion equation
   388,359.94 : 536,101.89 = 261,109.30 : x
2. Step 2: Convert to fraction form
   388,359.94/536,101.89 = 261,109.30/x
3. Step 3: Cross multiply
   388,359.94x = 536,101.89 × 261,109.30
4. Step 4: Simplify right side
   388,359.94x = 139,981,189,226.58
5. Step 5: Solve for x
   x = 139,981,189,226.58/388,359.94
6. Step 6: Final answer
   x = 360,441.89