Finding the Fourth Proportional to 389,498.42, 584,157.42 and 123,209.30

Step by Step Solution

1. Step 1: Write the proportion equation
   389,498.42 : 584,157.42 = 123,209.30 : x
2. Step 2: Convert to fraction form
   389,498.42/584,157.42 = 123,209.30/x
3. Step 3: Cross multiply
   389,498.42x = 584,157.42 × 123,209.30
4. Step 4: Simplify right side
   389,498.42x = 71,973,628,268.40
5. Step 5: Solve for x
   x = 71,973,628,268.40/389,498.42
6. Step 6: Final answer
   x = 184,785.42