Finding the Fourth Proportional to 389,009.41, 536,812.27 and 216,945.06

Step by Step Solution

1. Step 1: Write the proportion equation
   389,009.41 : 536,812.27 = 216,945.06 : x
2. Step 2: Convert to fraction form
   389,009.41/536,812.27 = 216,945.06/x
3. Step 3: Cross multiply
   389,009.41x = 536,812.27 × 216,945.06
4. Step 4: Simplify right side
   389,009.41x = 116,458,770,123.89
5. Step 5: Solve for x
   x = 116,458,770,123.89/389,009.41
6. Step 6: Final answer
   x = 299,372.63