Finding the Fourth Proportional to 278,930.52, 418,386.06 and 89,388.09

Step by Step Solution

1. Step 1: Write the proportion equation
   278,930.52 : 418,386.06 = 89,388.09 : x
2. Step 2: Convert to fraction form
   278,930.52/418,386.06 = 89,388.09/x
3. Step 3: Cross multiply
   278,930.52x = 418,386.06 × 89,388.09
4. Step 4: Simplify right side
   278,930.52x = 37,398,730,786.03
5. Step 5: Solve for x
   x = 37,398,730,786.03/278,930.52
6. Step 6: Final answer
   x = 134,079.02