Finding the Fourth Proportional to 258,002.68, 386,974.78 and 89,491.88

Step by Step Solution

1. Step 1: Write the proportion equation
   258,002.68 : 386,974.78 = 89,491.88 : x
2. Step 2: Convert to fraction form
   258,002.68/386,974.78 = 89,491.88/x
3. Step 3: Cross multiply
   258,002.68x = 386,974.78 × 89,491.88
4. Step 4: Simplify right side
   258,002.68x = 34,631,100,574.79
5. Step 5: Solve for x
   x = 34,631,100,574.79/258,002.68
6. Step 6: Final answer
   x = 134,227.68