Finding the Fourth Proportional to 258,076.80, 387,164.16 and 89,590.56

Step by Step Solution

1. Step 1: Write the proportion equation
   258,076.80 : 387,164.16 = 89,590.56 : x
2. Step 2: Convert to fraction form
   258,076.80/387,164.16 = 89,590.56/x
3. Step 3: Cross multiply
   258,076.80x = 387,164.16 × 89,590.56
4. Step 4: Simplify right side
   258,076.80x = 34,686,253,906.33
5. Step 5: Solve for x
   x = 34,686,253,906.33/258,076.80
6. Step 6: Final answer
   x = 134,402.84