Finding the Fourth Proportional to 389,499.42, 584,158.92 and 123,210.30

Step by Step Solution

1. Step 1: Write the proportion equation
   389,499.42 : 584,158.92 = 123,210.30 : x
2. Step 2: Convert to fraction form
   389,499.42/584,158.92 = 123,210.30/x
3. Step 3: Cross multiply
   389,499.42x = 584,158.92 × 123,210.30
4. Step 4: Simplify right side
   389,499.42x = 71,974,395,780.88
5. Step 5: Solve for x
   x = 71,974,395,780.88/389,499.42
6. Step 6: Final answer
   x = 184,786.91