Finding the Fourth Proportional to 258,291.39, 387,426.34 and 89,849.86

Step by Step Solution

1. Step 1: Write the proportion equation
   258,291.39 : 387,426.34 = 89,849.86 : x
2. Step 2: Convert to fraction form
   258,291.39/387,426.34 = 89,849.86/x
3. Step 3: Cross multiply
   258,291.39x = 387,426.34 × 89,849.86
4. Step 4: Simplify right side
   258,291.39x = 34,810,202,409.31
5. Step 5: Solve for x
   x = 34,810,202,409.31/258,291.39
6. Step 6: Final answer
   x = 134,771.05