Finding the Fourth Proportional to 386,921.50, 533,952.78 and 214,839.83

Step by Step Solution

1. Step 1: Write the proportion equation
   386,921.50 : 533,952.78 = 214,839.83 : x
2. Step 2: Convert to fraction form
   386,921.50/533,952.78 = 214,839.83/x
3. Step 3: Cross multiply
   386,921.50x = 533,952.78 × 214,839.83
4. Step 4: Simplify right side
   386,921.50x = 114,714,324,483.23
5. Step 5: Solve for x
   x = 114,714,324,483.23/386,921.50
6. Step 6: Final answer
   x = 296,479.59