Finding the Fourth Proportional to 258,320.34, 387,469.89 and 89,878.86

Step by Step Solution

1. Step 1: Write the proportion equation
   258,320.34 : 387,469.89 = 89,878.86 : x
2. Step 2: Convert to fraction form
   258,320.34/387,469.89 = 89,878.86/x
3. Step 3: Cross multiply
   258,320.34x = 387,469.89 × 89,878.86
4. Step 4: Simplify right side
   258,320.34x = 34,825,351,997.53
5. Step 5: Solve for x
   x = 34,825,351,997.53/258,320.34
6. Step 6: Final answer
   x = 134,814.59