Finding the Fourth Proportional to 389,697.31, 538,086.39 and 298,909.47

Step by Step Solution

1. Step 1: Write the proportion equation
   389,697.31 : 538,086.39 = 298,909.47 : x
2. Step 2: Convert to fraction form
   389,697.31/538,086.39 = 298,909.47/x
3. Step 3: Cross multiply
   389,697.31x = 538,086.39 × 298,909.47
4. Step 4: Simplify right side
   389,697.31x = 160,839,120,227.39
5. Step 5: Solve for x
   x = 160,839,120,227.39/389,697.31
6. Step 6: Final answer
   x = 412,728.33