Finding the Fourth Proportional to 555,238.50, 766,229.25 and 300,591.78

Step by Step Solution

1. Step 1: Write the proportion equation
   555,238.50 : 766,229.25 = 300,591.78 : x
2. Step 2: Convert to fraction form
   555,238.50/766,229.25 = 300,591.78/x
3. Step 3: Cross multiply
   555,238.50x = 766,229.25 × 300,591.78
4. Step 4: Simplify right side
   555,238.50x = 230,322,214,145.57
5. Step 5: Solve for x
   x = 230,322,214,145.57/555,238.50
6. Step 6: Final answer
   x = 414,816.72