Finding the Fourth Proportional to 278,933.52, 418,390.56 and 89,391.10

Step by Step Solution

1. Step 1: Write the proportion equation
   278,933.52 : 418,390.56 = 89,391.10 : x
2. Step 2: Convert to fraction form
   278,933.52/418,390.56 = 89,391.10/x
3. Step 3: Cross multiply
   278,933.52x = 418,390.56 × 89,391.10
4. Step 4: Simplify right side
   278,933.52x = 37,400,392,388.02
5. Step 5: Solve for x
   x = 37,400,392,388.02/278,933.52
6. Step 6: Final answer
   x = 134,083.53