Finding the Fourth Proportional to 389,864.56, 584,817.72 and 123,645.28

Step by Step Solution

1. Step 1: Write the proportion equation
   389,864.56 : 584,817.72 = 123,645.28 : x
2. Step 2: Convert to fraction form
   389,864.56/584,817.72 = 123,645.28/x
3. Step 3: Cross multiply
   389,864.56x = 584,817.72 × 123,645.28
4. Step 4: Simplify right side
   389,864.56x = 72,309,950,738.36
5. Step 5: Solve for x
   x = 72,309,950,738.36/389,864.56
6. Step 6: Final answer
   x = 185,474.54