Finding the Fourth Proportional to 394,071, 543,817.98 and 215,223

Step by Step Solution

1. Step 1: Write the proportion equation
   394,071 : 543,817.98 = 215,223 : x
2. Step 2: Convert to fraction form
   394,071/543,817.98 = 215,223/x
3. Step 3: Cross multiply
   394,071x = 543,817.98 × 215,223
4. Step 4: Simplify right side
   394,071x = 117,042,137,109.54
5. Step 5: Solve for x
   x = 117,042,137,109.54/394,071
6. Step 6: Final answer
   x = 297,007.74