Finding the Fourth Proportional to 389,616.55, 584,443.05 and 123,397.90

Step by Step Solution

1. Step 1: Write the proportion equation
   389,616.55 : 584,443.05 = 123,397.90 : x
2. Step 2: Convert to fraction form
   389,616.55/584,443.05 = 123,397.90/x
3. Step 3: Cross multiply
   389,616.55x = 584,443.05 × 123,397.90
4. Step 4: Simplify right side
   389,616.55x = 72,119,045,039.60
5. Step 5: Solve for x
   x = 72,119,045,039.60/389,616.55
6. Step 6: Final answer
   x = 185,102.62