Finding the Fourth Proportional to 389,086.48, 536,939.33 and 210,238.48

Step by Step Solution

1. Step 1: Write the proportion equation
   389,086.48 : 536,939.33 = 210,238.48 : x
2. Step 2: Convert to fraction form
   389,086.48/536,939.33 = 210,238.48/x
3. Step 3: Cross multiply
   389,086.48x = 536,939.33 × 210,238.48
4. Step 4: Simplify right side
   389,086.48x = 112,885,308,591.42
5. Step 5: Solve for x
   x = 112,885,308,591.42/389,086.48
6. Step 6: Final answer
   x = 290,129.10