Finding the Fourth Proportional to 389,620.55, 584,449.05 and 123,401.90

Step by Step Solution

1. Step 1: Write the proportion equation
   389,620.55 : 584,449.05 = 123,401.90 : x
2. Step 2: Convert to fraction form
   389,620.55/584,449.05 = 123,401.90/x
3. Step 3: Cross multiply
   389,620.55x = 584,449.05 × 123,401.90
4. Step 4: Simplify right side
   389,620.55x = 72,122,123,223.20
5. Step 5: Solve for x
   x = 72,122,123,223.20/389,620.55
6. Step 6: Final answer
   x = 185,108.62