Finding the Fourth Proportional to 394,870.57, 544,919.34 and 213,582.31

Step by Step Solution

1. Step 1: Write the proportion equation
   394,870.57 : 544,919.34 = 213,582.31 : x
2. Step 2: Convert to fraction form
   394,870.57/544,919.34 = 213,582.31/x
3. Step 3: Cross multiply
   394,870.57x = 544,919.34 × 213,582.31
4. Step 4: Simplify right side
   394,870.57x = 116,385,131,400.88
5. Step 5: Solve for x
   x = 116,385,131,400.88/394,870.57
6. Step 6: Final answer
   x = 294,742.48