Finding the Fourth Proportional to 389,513.34, 584,211.42 and 123,239.21

Step by Step Solution

1. Step 1: Write the proportion equation
   389,513.34 : 584,211.42 = 123,239.21 : x
2. Step 2: Convert to fraction form
   389,513.34/584,211.42 = 123,239.21/x
3. Step 3: Cross multiply
   389,513.34x = 584,211.42 × 123,239.21
4. Step 4: Simplify right side
   389,513.34x = 71,997,750,952.72
5. Step 5: Solve for x
   x = 71,997,750,952.72/389,513.34
6. Step 6: Final answer
   x = 184,840.27