Finding the Fourth Proportional to 258,483.16, 387,786.84 and 89,978.68

Step by Step Solution

1. Step 1: Write the proportion equation
   258,483.16 : 387,786.84 = 89,978.68 : x
2. Step 2: Convert to fraction form
   258,483.16/387,786.84 = 89,978.68/x
3. Step 3: Cross multiply
   258,483.16x = 387,786.84 × 89,978.68
4. Step 4: Simplify right side
   258,483.16x = 34,892,547,984.57
5. Step 5: Solve for x
   x = 34,892,547,984.57/258,483.16
6. Step 6: Final answer
   x = 134,989.64