Finding the Fourth Proportional to 389,786.61, 584,700.56 and 123,567.90

Step by Step Solution

1. Step 1: Write the proportion equation
   389,786.61 : 584,700.56 = 123,567.90 : x
2. Step 2: Convert to fraction form
   389,786.61/584,700.56 = 123,567.90/x
3. Step 3: Cross multiply
   389,786.61x = 584,700.56 × 123,567.90
4. Step 4: Simplify right side
   389,786.61x = 72,250,217,980.94
5. Step 5: Solve for x
   x = 72,250,217,980.94/389,786.61
6. Step 6: Final answer
   x = 185,358.39