Finding the Fourth Proportional to 395,109.25, 545,250.72 and 213,821.18

Step by Step Solution

1. Step 1: Write the proportion equation
   395,109.25 : 545,250.72 = 213,821.18 : x
2. Step 2: Convert to fraction form
   395,109.25/545,250.72 = 213,821.18/x
3. Step 3: Cross multiply
   395,109.25x = 545,250.72 × 213,821.18
4. Step 4: Simplify right side
   395,109.25x = 116,586,149,620.00
5. Step 5: Solve for x
   x = 116,586,149,620.00/395,109.25
6. Step 6: Final answer
   x = 295,073.20