Finding the Fourth Proportional to 394,109, 543,872.58 and 215,261

Step by Step Solution

1. Step 1: Write the proportion equation
   394,109 : 543,872.58 = 215,261 : x
2. Step 2: Convert to fraction form
   394,109/543,872.58 = 215,261/x
3. Step 3: Cross multiply
   394,109x = 543,872.58 × 215,261
4. Step 4: Simplify right side
   394,109x = 117,074,555,443.38
5. Step 5: Solve for x
   x = 117,074,555,443.38/394,109
6. Step 6: Final answer
   x = 297,061.36