Finding the Fourth Proportional to 258,308.24, 387,440.34 and 89,785.30

Step by Step Solution

1. Step 1: Write the proportion equation
   258,308.24 : 387,440.34 = 89,785.30 : x
2. Step 2: Convert to fraction form
   258,308.24/387,440.34 = 89,785.30/x
3. Step 3: Cross multiply
   258,308.24x = 387,440.34 × 89,785.30
4. Step 4: Simplify right side
   258,308.24x = 34,786,447,159.00
5. Step 5: Solve for x
   x = 34,786,447,159.00/258,308.24
6. Step 6: Final answer
   x = 134,670.30