Finding the Fourth Proportional to 389,872.56, 584,829.72 and 123,653.28

Step by Step Solution

1. Step 1: Write the proportion equation
   389,872.56 : 584,829.72 = 123,653.28 : x
2. Step 2: Convert to fraction form
   389,872.56/584,829.72 = 123,653.28/x
3. Step 3: Cross multiply
   389,872.56x = 584,829.72 × 123,653.28
4. Step 4: Simplify right side
   389,872.56x = 72,316,113,119.48
5. Step 5: Solve for x
   x = 72,316,113,119.48/389,872.56
6. Step 6: Final answer
   x = 185,486.54