Finding the Fourth Proportional to 393,784.50, 543,422.61 and 214,936.50

Step by Step Solution

1. Step 1: Write the proportion equation
   393,784.50 : 543,422.61 = 214,936.50 : x
2. Step 2: Convert to fraction form
   393,784.50/543,422.61 = 214,936.50/x
3. Step 3: Cross multiply
   393,784.50x = 543,422.61 × 214,936.50
4. Step 4: Simplify right side
   393,784.50x = 116,801,353,814.27
5. Step 5: Solve for x
   x = 116,801,353,814.27/393,784.50
6. Step 6: Final answer
   x = 296,612.37