Finding the Fourth Proportional to 389,926.10, 538,101.73 and 228,783.89

Step by Step Solution

1. Step 1: Write the proportion equation
   389,926.10 : 538,101.73 = 228,783.89 : x
2. Step 2: Convert to fraction form
   389,926.10/538,101.73 = 228,783.89/x
3. Step 3: Cross multiply
   389,926.10x = 538,101.73 × 228,783.89
4. Step 4: Simplify right side
   389,926.10x = 123,109,008,636.36
5. Step 5: Solve for x
   x = 123,109,008,636.36/389,926.10
6. Step 6: Final answer
   x = 315,723.95