Finding the Fourth Proportional to 386,238.72, 533,016 and 216,462.72

Step by Step Solution

1. Step 1: Write the proportion equation
   386,238.72 : 533,016 = 216,462.72 : x
2. Step 2: Convert to fraction form
   386,238.72/533,016 = 216,462.72/x
3. Step 3: Cross multiply
   386,238.72x = 533,016 × 216,462.72
4. Step 4: Simplify right side
   386,238.72x = 115,378,093,163.52
5. Step 5: Solve for x
   x = 115,378,093,163.52/386,238.72
6. Step 6: Final answer
   x = 298,722.23