Finding the Fourth Proportional to 389,899.69, 584,922.57 and 123,588.70

Step by Step Solution

1. Step 1: Write the proportion equation
   389,899.69 : 584,922.57 = 123,588.70 : x
2. Step 2: Convert to fraction form
   389,899.69/584,922.57 = 123,588.70/x
3. Step 3: Cross multiply
   389,899.69x = 584,922.57 × 123,588.70
4. Step 4: Simplify right side
   389,899.69x = 72,289,820,026.96
5. Step 5: Solve for x
   x = 72,289,820,026.96/389,899.69
6. Step 6: Final answer
   x = 185,406.20