Finding the Fourth Proportional to 389,978.96, 538,174.52 and 228,836.69

Step by Step Solution

1. Step 1: Write the proportion equation
   389,978.96 : 538,174.52 = 228,836.69 : x
2. Step 2: Convert to fraction form
   389,978.96/538,174.52 = 228,836.69/x
3. Step 3: Cross multiply
   389,978.96x = 538,174.52 × 228,836.69
4. Step 4: Simplify right side
   389,978.96x = 123,154,071,964.08
5. Step 5: Solve for x
   x = 123,154,071,964.08/389,978.96
6. Step 6: Final answer
   x = 315,796.71