Finding the Fourth Proportional to 389,488.50, 537,496.56 and 238,585.50

Step by Step Solution

1. Step 1: Write the proportion equation
   389,488.50 : 537,496.56 = 238,585.50 : x
2. Step 2: Convert to fraction form
   389,488.50/537,496.56 = 238,585.50/x
3. Step 3: Cross multiply
   389,488.50x = 537,496.56 × 238,585.50
4. Step 4: Simplify right side
   389,488.50x = 128,238,885,515.88
5. Step 5: Solve for x
   x = 128,238,885,515.88/389,488.50
6. Step 6: Final answer
   x = 329,249.48