Finding the Fourth Proportional to 389,860.56, 584,811.72 and 123,641.28

Step by Step Solution

1. Step 1: Write the proportion equation
   389,860.56 : 584,811.72 = 123,641.28 : x
2. Step 2: Convert to fraction form
   389,860.56/584,811.72 = 123,641.28/x
3. Step 3: Cross multiply
   389,860.56x = 584,811.72 × 123,641.28
4. Step 4: Simplify right side
   389,860.56x = 72,306,869,619.80
5. Step 5: Solve for x
   x = 72,306,869,619.80/389,860.56
6. Step 6: Final answer
   x = 185,468.54