Finding the Fourth Proportional to 389,818.50, 537,953.52 and 228,676.29

Step by Step Solution

1. Step 1: Write the proportion equation
   389,818.50 : 537,953.52 = 228,676.29 : x
2. Step 2: Convert to fraction form
   389,818.50/537,953.52 = 228,676.29/x
3. Step 3: Cross multiply
   389,818.50x = 537,953.52 × 228,676.29
4. Step 4: Simplify right side
   389,818.50x = 123,017,215,146.04
5. Step 5: Solve for x
   x = 123,017,215,146.04/389,818.50
6. Step 6: Final answer
   x = 315,575.62