Finding the Fourth Proportional to 395,266.79, 545,468.33 and 213,978.71

Step by Step Solution

1. Step 1: Write the proportion equation
   395,266.79 : 545,468.33 = 213,978.71 : x
2. Step 2: Convert to fraction form
   395,266.79/545,468.33 = 213,978.71/x
3. Step 3: Cross multiply
   395,266.79x = 545,468.33 × 213,978.71
4. Step 4: Simplify right side
   395,266.79x = 116,718,605,802.02
5. Step 5: Solve for x
   x = 116,718,605,802.02/395,266.79
6. Step 6: Final answer
   x = 295,290.70