Finding the Fourth Proportional to 389,399.86, 537,615.06 and 298,581.34

Step by Step Solution

1. Step 1: Write the proportion equation
   389,399.86 : 537,615.06 = 298,581.34 : x
2. Step 2: Convert to fraction form
   389,399.86/537,615.06 = 298,581.34/x
3. Step 3: Cross multiply
   389,399.86x = 537,615.06 × 298,581.34
4. Step 4: Simplify right side
   389,399.86x = 160,521,825,018.98
5. Step 5: Solve for x
   x = 160,521,825,018.98/389,399.86
6. Step 6: Final answer
   x = 412,228.77